I was looking at my Astronomical Points with the free astronomy program Stellarium which I have just started recently using for Astrology including especially Deep Space Astrology.
birthdata
October 29, 1971
San Francisco, California
3:20 AM
The following is from the site Matrix Astrology Software site by Michael Erlewine
Visual Astrology
Ecliptic Coordinate System
Ecliptic Coordinates
In this system, the ecliptic or plane through the Earth's orbit is taken as the plane of reference. The co-ordinates used are Celestial Latitude (the perpendicular distance of the object from the ecliptic in angular measure) and Celestial Longitude (the angular distance along the ecliptic between the plane through the object and the First Point of Aries). The Solstitial Colure is the great circle which passes through the summer and winter solstices (the hour circle of R.A. 90° and 270°).
Ecliptic Sphere
Also called the Zodiac Sphere, this is the sphere resulting from projecting the plane of the Earth's orbit and points (its poles) 90° north and south of that plane.
Ecliptic Plane
The ecliptic is a plane that passes through the centers of the Earth and the Sun. It represents the path the Sun's center takes each year on the celestial sphere as seen from the Earth or the Earth's path as seen around the Sun.
North Ecliptic Pole
The point on the ecliptic sphere that are 90 degrees from the plane of the ecliptic, to the North or 'above'.
NEP
North Ecliptic Pole
South Ecliptic Pole
The point on the ecliptic sphere that are 90 degrees from the plane of the ecliptic, to the South or 'below'.
SEP
South Ecliptic Pole
Obliquity of the Ecliptic
The 23 1/2° angle (23°27') that represents the inclination of the ecliptic to the celestial equator. This also marks the maximum angular distance that the Sun can reach north or south of the celestial equator at the times of the solstices.
Celestial Latitude (Ecliptic Latitude)
The angular distance of any object measured north or south of the plane of the ecliptic to the poles, from 0° to 90°.
Celestial Longitude (Ecliptic Longitude)
The angular distance of any object as measured from zero Aries to a plane through an object.
Zodiac
From a Greek word meaning the 'circle of animals', is a belt about 18° wide (9° above and 9° below the plane of the ecliptic) within which the planets travel. This circle is divided into 12 equal 30° sections, the signs of the zodiac -- Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces. At one point (over 2000 years ago), the signs of the zodiac corresponded with the constellations of the same name. However, due to precession, the signs have drifted westward (backward) until today they are almost an entire sign (30°) off.
Solstices
The longest and shortest days of the year, when the Sun reaches its greatest angular distance from the equator. The longest day is the summer solstice (around June 21) and the shortest day is the winter solstice (around December 22). These two are reversed in the southern hemisphere.
Solstice Points
The instant when the Sun is at either the summer or winter solstice.
Equinoxes (Spring and Fall)
This is the instant when Sun crosses the celestial equator at either its ascending node (Spring Equinox, about March 21) or its descending node (Fall Equinox, September 23). At the Spring Equinox, the Sun moves north of the ecliptic plane, while at the fall Equinox, it moves from north to south.
Fall Equinox (Autumnal Equinox)
Zero Aries
The intersection of the celestial equator and the ecliptic. This point undergoes a very slow backward movement.
Colures
There are two, the equinoctial colure and the solstitial colure. The equinoctial colure is the hour circle that passes through the vernal and autumnal equinoctial points (RA 0h and 12 h). The solstitial colure is the hour circle that passes through the summer and winter solstices (0° points of the tropical zodiac signs Cancer and Capricorn at RA 6h and 18h).
© Copyright © 1997 Michael Erlewine
Equatorial Coordinates
In this system, the Earth's Equator is the plane of reference. The poles are at the intersection of the Earth's pole and the pole of the celestial sphere, an imaginary surface at an infinite distance with the Earth as its center. This is true for all points on the Earth, latitude and longitude. The poles are the North Celestial Pole (NCP) and South Celestial Pole (SCP). The circle at the intersection of the plane of the Earth's equator and the celestial sphere is the Celestial Equator.
The great circle through the celestial poles and the object (such as a star) is the object's Hour Circle and the great circle which passes through the celestial poles and the zenith is the Meridian Circle. The coordinates in this system are given by Declination (angle between the celestial equator and the object) and the Right Ascension (angle measured from an arbitrary reference direction -- the Vernal Equinox -- to the object's hour circle). In Figure C, the darker lines express the position of a star (S) in both ecliptic and equatorial coordinates.
Equatorial Sphere
Also called the Celestial Sphere, this is the sphere resulting from projecting the Earth infinitely into space and it is defined by the celestial equator and the north and south celestial poles.
Celestial Poles
These are directly overhead the Earth's geographic poles and are the poles of rotation of the celestial sphere of right ascension and declination.
SCP — South Celestial Pole
Celestial Equator
A great circle projected from the Earth's equator unto the heavens, an infinite projection. The celestial equator has as its poles the celestial poles and all points on the celestial equator are equidistant from the two poles. As the Earth's equator rotates each day, it exposes each city on the equator to every degree of the celestial equator.
Equinoctial
Another term for the celestial equator (which see).
Celestial Sphere
An infinite extension of the sphere of the Earth in space.
Hour Circles
Hour circles are great circles passing through any celestial object and through the celestial poles. All hour circles are at right angles to the celestial equator.
R.A.
(See Right Ascension)
Right Ascension (R.A.)
The angle between an hour circle passing through an object and the meridian plane, in the case of equatorial coordinates, zero degrees of Aries. R.A. is measured eastward on the celestial equator from what is called the True Equinox to the body in question. R.A. is expressed in either degrees (0° to 360°) or in Hours-Minutes-Seconds (0h to 24h).
Declination
The angular distance of any object measured north or south of the plane of the celestial equator, from 0° to 90°.
Declination Circle
Parallel circles of declination either north or south of the plane of the celestial equator.
Parallel of Declination
Parallel circles of declination either north or south of the plane of the celestial equator.
Equatorial Plane
The infinite extension of the equator of the Earth in all directions.
Meridian
A great circle on the celestial sphere through the celestial poles, the zenith of any place or locale, and the north and south points on the horizon.
Prime Meridian
The point of zero longitude measurement for any celestial body. In the case of the Earth, the prime meridian is considered to be Greenwich, England.
Transit
The passage of a celestial object across a particular meridian.
© Copyright © 1997 Michael Erlewine
Horizon Coordinate System
Horizon Coordinate
In this system a plane through the observing point parallel to the horizon is the plane of reference. The poles are the Zenith (point overhead) and the Nadir (point underfoot). The vertical circle through a celestial object (such as a star) and the zenith is the Object Circle. The coordinates are given (for the object) by Azimuth (horizontal angle measured from an arbitrary reference direction — East in our case — counterclockwise to the object circle) and the Altitude (elevation angle measured upward from the horizon to the object). The great circle through the north and south points and the zenith is the Meridian, and the great circle through the east and west points and the zenith is the Prime Vertical. Circles of parallel altitude to the horizon that are not great circles are called Almucantars.
Horizon Sphere
A heavenly sphere based on the plane of the observer's local horizon (90° from both the zenith and the nadir), but taken from the center of the Earth.
Zenith
The zenith is the point directly overhead any spot on Earth.
Nadir
The nadir is the point directly beneath (opposite the zenith) any spot on Earth.
Altitude
The angular distance of any body above or below the plane of the local horizon. Altitude is measured from 0° to 90° from the plane of the horizon to either pole.
Azimuth
The angle measured around the 360° circumference of the horizon, either east or west (there are different practices). The azimuth of an object as measured from the meridian plane of the observer and a vertical plane through any body.
Prime Vertical
A great circle passing through the zenith (north pole), nadir (south pole), and the east and west points on the horizon.
Altitude Circles
Parallel circles of altitude, wither north or south of the plane of the horizon.
Almuncantar
Parallel circles of altitude, wither north or south of the plane of the horizon.
North Point
A point on the horizon to the north of the observer, where the meridian plane intersects the horizon.
South Point
A point on the horizon to the south of the observer, where the meridian plane intersects the horizon.
East Point
A point on the horizon to the east of the observer, where the prime vertical plane intersects the horizon.
West Point
A point on the horizon to the west of the observer, where the prime vertical plane intersects the horizon.
© Copyright © 1997 Michael Erlewine
The following is from Michael Erlewine , founder of Matrix Software
There seem to be at least several distinct levels or dimensions to our life, and depending upon the clarity of the day, our awareness may be centered in a dimension ranging from the very mundane on up thru an occasional sharing in some sort of more transpersonal or cosmic form of consciousness. It is becoming clear to many astrologers in these times that this multi-dimensionality of our life perhaps may best be represented and examined thru a series of astrological charts; and that an attempt to extract all levels of our life -- the many quite different dimensions -- from the geocentric ecliptic chart alone is bound to be a frustrating experience. In a word it is: un-necessary.
Astrologers make regular use of three very different systems of coordinates (whether they are aware of it or not) each time they erect a natal chart: namely, (1) the Zodiac or Ecliptic, (2) the Equatorial system (right ascension and declination), and (3) the Horizon system of coordinates. The actual distinction beteen these different systems of coordinates are lost to most of us, and they are jumbled together to form some kind of zodiac pie. It has become my realization that these basic physical planes of reference -- the Horizon, Equator, Ecliptic, and even the Galactic and Supergalactic planes -- correspond symbolically to the various different dimensions or levels of our consciousness -- as they exist NOW, in mutual interpenetration. These levels can be sorted out; and as astrologers I may learn to read these different levels as separate, yet related and whole dimensions of our experience.
Let me rephrase all of this. Our Universe, and therefore our Life, can be described or expressed in astrological terms using any one of several fundamental planes of reference: Ecliptic, Horizon, etc. These different planes and their respective coordinate systems are like different languages (or algebras), in that they each can express the same moment in time, the same planets -- in fact, each can express the entire universe; and yet each orders these same objects and data in a different way so as to bring out and raise a particular dimension of reality above the general threshold of our life and awareness. Since our life and consciousness appear to flow thru, at least, several quite distinct levels, it is my conviction that the most sensible method by which to express or map these different levels is thru such fundamental orderings, or reference planes. As astrologers, our almost exclusive concern for the plane of the earth's orbit -- the ecliptic or zodiac -- and the relation of all activity to this plane results in a loss of contrast and dimensionality that the use of these alternative coordinate systems provide.
There are at least two basic factors to consider when examining the various coordinate systems available to us; and they are summed up in the familiar axiom, "As Above, So Below; yet after another manner." The first factor, "As Above, So Below", is an indication that the various coordinate systems may be ordered to form a hierarchy in terms of a progressive "inclusivity", or greater comprehensiveness. In other words, the Galactic coordinate system includes the heliocentric within itself, the heliocentric includes the geocentric, the geocentric includes the Horizon, and so forth. This represents the "As Above, So Below" portion of the phrase; and this "wheels within wheels within wheels" concept is well understood, and a popular one thru which to express the various dimensions of consciousness. In other words, a large frame of reference or coordinate system somehow involves information of a larger or more meta-physical kind when considered in relation to a more particular or less inclusive system.
The second factor to be illustrated in the phrase, "As Above, So Below; yet after another manner" while of equal importance is less well understood. The great reference planes and their respective systems of coordinates are not only inclusive of one another (that is, larger and smaller in relation to each other), but they are also inclined at different angles or attitudes to one another. In other words, learning to use and understand the nature of a more inclusive system such as the Ecliptic or Zodiac system, in relation to the Equatorial or "Right Sphere" system, is not only a matter of ordering the information along a different plane (taking a larger view or picture); but also involves a fundamental change in attitude, or inclination. This shift in attitude, or reorientation of attitude, is an important concept for astrologers to consider and to absorb.
Let me present an analogy which might relate to interpreting these various planes in our everyday life. As a society, I are becoming ever more aware of the Cosmic or transpersonal perspective as being associated with the idea of expanded consciousness, with a more whole-view, etc.; yet I have not understood on this same broad social level, that such a change in scale or scope may also involve a basic change in attitude: a fundamental change in the approach to life.
In other words, growing up is not just a process of taking a more inclusive approach, it can involve a change in attitude or perspective. We can no longer be inclined in directions we once were; and this must amount to a radical change -- that is, change at "root" level -- in our activity! Furthermore, a basic misunderstanding as to what is involved in spiritual growth has resulted from an attempt to view such growth exclusively as some kind of "enlargement"; one wistfully looks forward to growing beyond the particular terms of his everyday existence. This is a result of ignorance of the change in attitude -- the change in point of view, or vantage point -- that accompanies true spiritual development: a change very difficult to imagine or assess for one not aware that such change is a natural and expected part of any deeper initiation.
So much for metaphysics. Much of my own research has revolved around these various coordinate systems and the dimensions of life they describe. In particular, I have been concerned with the inclinations or attitudes of one system to another. I like to tell myself that the reason for this interest may be due to the fact that I was born with such a "bad" attitude toward some facets of life in this world, that vast changes in attitude on my part have been necessary simply for my survival. Let me repeat: these different coordinate systems are great languages or orderings of our total reality and each one raises to our attention its characteristic gestalt or whole dimension of life. To my knowledge, L. Edward Johndro was the first modern astrologer to make a life-long concern the articulation of the difference between whole coordinate systems (Ecliptic and Equator). And in my opinion, a final assessment of Johndro's work may not deal so much in terms of his technical genius alone as with the scope and comprehension of his vision; and in particular, that focus of it relating to the essential differences between events as interpreted on the ecliptic or on the equator. In recent years, this research has been carried on and developed further by Charles Jayne, Theodor Landscheidt, and others
The Astrology of Local Space (astrologysoftware.com)
Like Michael Erlewine, I never settled with using just Ecliptical Coordinates. I use the Equatorial Coordinates and Horizontal Coordinates
Ascendant in Leo
Point of intersection between the Horizon and Ecliptic in the Eastern Hemisphere
Right Ascension - 10hr59min00s
Declination - 6deg30min North
Leo constellation lies in the northern sky. It is one of the zodiac constellations and one of the largest constellations in the sky.
Leo represents the lion and is usually associated with the Nemean lion in Greek mythology. Its symbol is 
. The constellation was first catalogued by the Greek astronomer Ptolemy in the 2nd century, along with all the other constellations of the zodiac.
Leo is the 12th largest constellation in size, occupying an area of 947 square degrees. It is located in the second quadrant of the northern hemisphere (NQ2) and can be seen at latitudes between +90° and -65°. The neighboring constellations are Cancer, Coma Berenices, Crater, Hydra, Leo Minor, Lynx, Sextans, Ursa Major and Virgo.
Leo Constellation: Stars, Facts, Myth, Location... | Constellation Guide (constellation-guide.com)
Mul UrGu-la (The Lion) - Leo
www.skyscript.co.uk/babylonian_leo.pdf
Descendant in Aquarius
Point of Intersection between the Horizon and Ecliptic in the Western Hemisphere
Right Ascension - 22hr59min00s
Declination - 6deg30min South
Aquarius constellation is located in the southern hemisphere. It is one of the 12 zodiac constellations. The constellation’s name means “the water-bearer” (or “cup-bearer”) in Latin and its symbol is 
, which represents water.
Aquarius lies in the region of the sky which is sometimes referred to as the Sea, because it contains a number of other constellations with names associated with water; Pisces (the fish), Eridanus (the river), and Cetus (the whale), among others. Like other zodiac constellations, Aquarius was catalogued by the Greek astronomer Ptolemy in the 2nd century.
Aquarius is the 10th largest constellation in the sky, occupying an area of 980 square degrees.
It is located in the fourth quadrant of the southern hemisphere (SQ4) and can be seen at latitudes between +65° and -90°. The neighboring constellations are Aquila, Capricornus, Cetus, Delphinus, Equuleus, Pegasus, Pisces, Piscis Austrinus, and Sculptor.
Mul Gu-la (The Great One) - Aquarius
www.skyscript.co.uk/babylonian_aquarius.pdf
Midheaven in Taurus
Point of intersection between the Meridian and Ecliptic in the Southern Hemisphere
Right Ascension - 4hr38min42sec
Declination - 22deg07min North
Taurus is a large constellation in the northern sky. Its name means “bull” in Latin. The constellation is symbolized by the bull’s head, 
. It is one of the oldest constellations. Its history dates back to the Bronze Age.
Taurus is one of the 12 constellations of the zodiac, first catalogued by the Greek astronomer Claudius Ptolemy in the 2nd century CE. In Greek mythology, the constellation is associated with Zeus, who transformed himself into a bull to get close to Europa and abduct her.
Taurus is the 17th largest constellation in the sky, occupying an area of 797 square degrees. It is located in the first quadrant of the northern hemisphere (NQ1) and can be seen at latitudes between +90° and -65°. The neighboring constellations are Aries, Auriga, Cetus, Eridanus, Gemini, Orion and Perseus.
Mul Gu-An-na (The Bull of Heaven) - Taurus
www.skyscript.co.uk/babylonian_taurus.pdf
Imum Coeli in Ophiuchus
Intersection point between the Meridian and Ecliptic in the Northern Hemisphere
Right Ascension - 16hr38m42sec
Declination - 22deg97min South
Ophiuchus constellation lies in the southern sky, near the celestial equator. Its name means “the serpent bearer” in Greek.
It is pronounced /ˌɒfiːˈjuːkəs/ (off-ee-YOO-cuss). The constellation is associated with the figure of Asclepius, the famous healer in Greek mythology. It was one of the constellations first catalogued by the Greek astronomer Ptolemy in the 2nd century. Sometimes, it is also known by its Latin name, Serpentarius. Ophiuchus is generally depicted as a man holding a snake, represented by the neighboring constellation Serpens, which is divided into two parts by Ophiuchus: Serpens Caput, the snake’s head, and Serpens Cauda, the snake’s tail. The snake is usually depicted coiled around his waist.
Even though Ophiuchus is one of the constellations that cross the ecliptic and there have been attempts to include it among the signs of the zodiac, it does not belong to the Zodiac family, but to the Hercules family of constellations.
Ophiuchus is the 11th largest constellation in the sky, occupying an area of 948 square degrees. It is located in the third quadrant of the southern hemisphere (SQ3) and can be seen at latitudes between +80° and -80°. The neighboring constellations are Aquila, Hercules, Libra, Sagittarius, Scorpius and Serpens.
Vertex in Capricornus
Intersection between the Prime Vertical and Ecliptic in Western Hemisphere
Right Ascension - 21hr09min45sec
Declination - 16deg20min South
Azimuth - 270deg
Capricornus is a faint zodiac constellation located in the southern sky. Its name means “the goat” in Latin. The constellation represents a sea goat, a mythical creature associated with the god Enki in Babylonian mythology and later with the Greek deity Pan. The constellation is represented by the symbol 
.
Like other zodiac constellations, Capricornus was first catalogued by the Greek astronomer Claudius Ptolemy in his Almagest in the 2nd century CE. In Greek mythology, the constellation is associated with Pan, the god of the wild, and with the goat Amalthea, who suckled Zeus when he was very young.
Capricornus is the 40th biggest constellation in the sky, occupying an area of 414 square degrees. It lies in the fourth quadrant of the southern hemisphere (SQ4) and can be seen at latitudes between +60° and -90°. The neighboring constellations are Aquarius, Aquila, Microscopium, Piscis Austrinus, and Sagittarius. The best time of year to see Capricornus is during the month of September.
Mul Suhur-Maš-Ku (The Goatfish) - Capricorn
www.skyscript.co.uk/babylonian_capricorn.pdf
AntiVertex in Cancer
Point of intersection between the Prime Vertical and Ecliptic
Right Ascension - 9hr09min45sec
Declination - 16hr20min North
Azimuth - 90deg
Cancer constellation is located in the northern sky. Its name means “the crab” in Latin. Cancer is the faintest of the 12 zodiac constellations. Its symbol is 
. The constellation was first catalogued by the Greek astronomer Ptolemy in his Almagest in the 2nd century CE.
In Greek mythology, the constellation Cancer is associated with the crab sent by Hera to kill Heracles. In different versions of the myth, the crab is either kicked into the sky by Heracles or placed among the stars by Hera after getting crushed by the Greek hero.
Cancer is the 31st largest constellation in the sky, occupying an area of 506 square degrees. It lies in the second quadrant of the northern hemisphere (NQ2) and can be seen at latitudes between +90° and -60°. The neighboring constellations are Canis Minor, Gemini, Hydra, Leo, Leo Minor, and Lynx.
Mul Al-lul (The Crab) - Cancer
www.skyscript.co.uk/babylonian_cancer.pdf
North Point in Draco
Point of intersection between the Meridian and Horizon in the Northern Hemisphere
Its Right Ascension is the same as the Imum Coeli's due to both being on the Meridian in the Northern Hemisphere - 16hr38min42sec
Draco is one of the largest constellations in the sky. Located in the northern celestial hemisphere, the constellation represents Ladon, the dragon that guarded the gardens of the Hesperides in Greek mythology. The name Draco means “the dragon” in Latin.
Draco is one of the Greek constellations. It was first catalogued by the Greek astronomer Ptolemy in the 2nd century. It is a circumpolar constellation; it never sets below the horizon for many observers in the northern hemisphere.
Draco is the eighth largest constellation in the night sky, occupying an area of 1083 square degrees. It lies in the third quadrant of the northern hemisphere (NQ3) and can be seen at latitudes between +90° and -15°. The neighboring constellations are Boötes, Camelopardalis, Cepheus, Cygnus, Hercules, Lyra, Ursa Major, and Ursa Minor.
East Point in Sextans
Point of intersection between the Prime Vertical, Horizon, and Equator in the Eastern Hemisphere
Its Right Ascension is the same as the East Point's - 10hr38min42sec
Declination - 0deg (Equator's latitude)
Its Azimuth is same as Antivertex's due to both being on the Prime Vertical in the Eastern Hemisphere - 90deg
Sextans constellation lies in the southern sky, near the celestial equator. It represents the astronomical sextant.
Sextans is located in a dim region of the sky between the constellations Hydra, Crater, and Leo. The constellation was created by the Polish astronomer Johannes Hevelius in the 17th century. It is a rather faint one, with only one star brighter than fifth magnitude.
Sextans is the 47th constellation in size, occupying an area of 314 square degrees. It is located in the second quadrant of the southern hemisphere (SQ2) and can be seen at latitudes between +80° and -90°. The neighboring constellations are Crater, Hydra and Leo.
Sextans Constellation: Stars, Story, Facts, Location | Constellation Guide (constellation-guide.com)
South Point in Pictor
Point of intersection between the Meridian and the Horizon in the Southern Hemisphere
Its Right Ascension is the same as the Midheaven's due to both being on the Meridian in the Southern Hemisphere - 4hr38min42sec
Pictor constellation lies in the southern sky. Its name is Latin for “painter,” but the constellation really represents the painter’s easel.
Pictor can be found between the bright star Canopus in Carina constellation and the Large Magellanic Cloud in Dorado and Mensa.
The constellation was introduced by the French astronomer Nicolas Louis de Lacaille in the 18th century. Its early name, Equuleus Pictoris, Latin for “the painter’s easel,” was later shortened to simply Pictor.
Pictor is the 59th constellation in size, occupying an area of 247 square degrees. It is located in the first quadrant of the southern hemisphere (SQ1) and can be seen at latitudes between +26° and -90°. The neighboring constellations are Caelum, Carina, Columba, Dorado, Puppis and Volans.
West Point in Aquarius
Point of intersection between the Prime Vertical, Horizon, and Equator in the Western Hemisphere
Its Right Ascension is the same as the West Point's - 22hr38min42sec
Declination - 0deg00min (Equator's Latitude)
Its Azimuth is the same as the Vertex's due to both being on the Prime Vertical in the Western Hemisphere - 270deg
Zenith in Perseus
Point of intersection between the Prime Vertical and Meridian in the Southern Hemisphere
Its Right Ascension is the same as the Midheaven due to both being on the Meridian in the Southern Hemisphere - 4hr38min42sec
Perseus constellation lies in the northern sky, next to Andromeda. It was named after the hero Perseus in Greek mythology.
Perseus is one of the larger northern constellations. It was first catalogued by the Greek astronomer Ptolemy in the 2nd century. The constellation is best known for its annual Perseid meteor shower.
Perseus is the 24th largest constellation in the sky, occupying an area of 615 square degrees. It is located in the first quadrant of the northern hemisphere (NQ1) and can be seen at latitudes between +90° and -35°. The neighboring constellations are Andromeda, Aries, Auriga, Camelopardalis, Cassiopeia, Taurus and Triangulum.
Perseus Constellation: Location, Stars, Myth, Facts | Constellation Guide (constellation-guide.com)
Nadir in Scorpius
Point of intersection between the Prime Vertical and Meridian in the Northern Hemisphere
Its Right Ascension is the same as the Imum Coeli's due to both being on the Meridian in the Northern Hemisphere - 16hr38min42sec
Scorpius constellation lies in the southern sky. It represents the scorpion and is associated with the story of Orion in Greek mythology.
Scorpius is one of the zodiac constellations, first catalogued by the Greek astronomer Ptolemy in the 2nd century. Its symbol is 
. Scorpius pre-dates the Greeks, and is one of the oldest constellations known. The Sumerians called it GIR-TAB, or “the scorpion,” about 5,000 years ago.
Scorpius is the 33rd constellation in size, occupying an area of 497 square degrees. It lies in the third quadrant of the southern hemisphere (SQ3) and can be seen at latitudes between +40° and -90°. The neighboring constellations are Ara, Corona Australis, Libra, Lupus, Norma, Ophiuchus and Sagittarius.
Mul Gir-tab (The Scorpion) - Scorpio
www.skyscript.co.uk/babylonian_scorpio.pdf
As I was checking out my Zenith and Nadir which are points that the Prime Vertical runs through, I noticed some bright stars that are on my Prime Vertical.
A heavenly body is in or on the prime vertical when it bears true east or true west—when it is at right angles to the meridian. When a body is observed on the prime vertical for the purpose of calculating the longitude, a consider error in the latitude by dead-reckoning (used in the computation) will not appreciable affect the result. By this it will be understood that the best time to observe a longitude sight (be it sun, moon, planet, or star) is when the body is on the prime vertical ; but it is to be explained that it is not always possible to obtain such an observation, for a heavenly body can only be true east or true west when its declination is of the same name as the ship's latitude and less than the latter. When the declination of the body is of the same name but greater than the ship's latitude, the body's nearest approach will be some time after it has risen; but when the declination is of a contrary nature to the latitude, the body will be the nearest to the prime vertical at its rising and setting.
The Navigator's Pocket-book - Howard Patterson - Google Books
Pollux aka beta Geminorium
Magnitude - 1.15
Azimuth - 90deg08min32.2sec (bears true east which is 90 degrees)
It conjuncts AntiVertex in Azimuth chart.
Pollux (Beta Geminorum): Star Type, Name, Planet, Constellation | Star Facts (star-facts.com)
Mul Maš-tab-ba-gal-gal (The Great Twins) - Gemini
www.skyscript.co.uk/babylonian_gemini.pdf
Shaula aka lamda Scorpii
Magnitude - 1.60
Azimuth - 269deg41min17.3sec (bears true west which is 270 degrees)
It conjuncts Vertex in Azimuth chart.
Shaula (Lambda Scorpii): Spectral Class, Name, Location, Constellation | Star Facts (star-facts.com)
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