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      • BABYLONIAN ZODIAC ASTRONOMICAL COORDINATES

      BABYLONIAN ZODIAC ASTRONOMICAL COORDINATES

      • Posted by krasi
      • Categories Astronomy
      • Date 22.09.2017
      • Comments 0 comment

      Abstract

      Ecliptical coordinates of Babylonian zodiac signs are found. A simple and easy to use mapping manual is given.

      1. Approach

      Our goal here is to find the mapping between the contemporary astronomical coordinate systems and the coordinate system used in ancient Babylon which was the Babylonian zodiac. Having this mapping will make us able to project any celestial body on Babylonian zodiac using it’s contemporary astronomical coordinates. We are going to use following sources and tools:

      • „The Babylonian Zodiac”, Robert Powell, Ph.D.
      • Swiss Ephemeris – Sidereal Calculations
      • Bright starts almanac fromhttp://www.alcyone.de/
      • Astronomical calculator (12)

       

      In order to find every zodiacal sign start coordinates we are using the ecliptical coordinates of Aldebaran. These coordinates are precession and nutation dependant and are calculated for given astronomical epoch. We will use the astronomical epoch J2000 here (01.01.2000).

      1. Babylonian zodiac coordinates calculation

      Here are various options about starting point of the fixed Babylonian zodiac as per different researches. The latest research works are using zodiac coordinates fixing using Aldebaran placed exactly at 15° 00′ 00“ Taurus. At the opposite side Antares is placed almost at the middle in the Scorpio. This option is given as “Äldebaran – Antares Ayanamsha” in Swiss Ephemeris project (2).
      The equatorial astronomical coordinates for epoch J2000 as per bright stars almanac follows:

      Star
      RA, h
      Decl, deg
      Longitude, deg
      Latitude,deg
      Aldebaran (1)
      04h35m55.2s
      +16:30:33
      69,78901345
      -5.46743903
      Antares (2)
      16h29m24.4s
      -26:25:55
      249,76206354
      -4.56992146

       

      We convert equatorial coordinates to ecliptical ones using an astronomical calculator. Let us calculate the difference between the ecliptigal longitude of these two stars:

      Long2 – Long1 = 249,76206354 – 69,78901345 = 179,97305009 deg = 179°58’23“

      We notice that the difference is almost 180 degrees with only 2 angular minutes inaccuracy.

      To find the coordinates of beginning of Aries sign L0 (0 Aries) over ecliptics we substract 45 degrees from the longitude of Aldebaran. This way we have:

      L0 = 69,78901345 – 45 = 24,78901345

      Having this we are able to calculate the ecliptical boundaries of each zodiacal sign for J2000 epoch in fraction of angular degrees.

      Sign
      Start
      End
      Aries
      24,78901345
      54,78901345
      Taurus
      54,78901345
      84,78901345
      Gemini
      84,78901345
      114,7890135
      Cancer
      114,7890135
      144,7890135
      Leo
      144,7890135
      174,7890135
      Virgo
      174,7890135
      204,7890135
      Libra
      204,7890135
      234,7890135
      Scorpio
      234,7890135
      264,7890135
      Saggitarius
      264,7890135
      294,7890135
      Capricorn
      294,7890135
      324,7890135
      Aquarius
      324,7890135
      354,7890135
      Pisces
      354,7890135
      24,78901345

       

      Having this we are able to project arbitrary celestial body over the fixed Babylonian zodiac, using the following algorithm:

      • Finding the equatorial astronomical coordinates using almanac or astronomical software (RA и Decl) for epoch J2000 (01.01.2000).
      • Calculating the ecliptical coordinates using free astronomical calculation tool (1, 2).
      • Comparing the ecliptical longitude of the celestial body with the signs boundaries in the table. Finding the sign and the position within the sign using a simple substraction operation.

       

      1. Example: finding the exact position of Regulus over the Babylonian fixed zodiac.

       

      We open the almanac and found Regulus astronomical equatorial coordinates for epoch J2000:

      RA:
      DEC:
      10h 8min 22,3sec
      +11° 58′ 2“

      We transform the coordinates in a suitable for the calculator format:

      RA
      DEC:
      10h08m22.3s
      +11:58:02

       

      We put these data into the astronomical calculator and got following as a result:

      Input: Equatorial J2000.0
      RA or Longitude   DEC or Latitude   PA(East of North)
      152.09291667      11.96722222       0.000000
      10h08m22.30000s   +11d58m02.0000s
       Output: Ecliptic J2000.0
      149.82908740      0.46483569        339.419054

       

      Where 149.82908740 is the ecliptical longitude of Regulus in fragtion of angular degrees. We notice that Regulus lays between the sign Leo boundaries. But where in Leo exactly – is the next question we must answer. So we substract the Leo start ecliptical position from the ecliptical position of Regulus:

      L_Regulus_Leo = 149,82908740 – 144,7890135 = 5,0400739.

      We transform fraction angular degree to angular degrees, minutes and seconds using a calculator. Finally we got:

      The exact position of Regulus over the fixed Babylonian zodiac is 5⁰02’24.27’’ Leo.

       

       

      Vasil Vasilev, 12.09.2017

       

       

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      krasi

      Bulgarian sidereal astrologer of ancient astrology

      Dr. Krasi Attasio DMA is Bulgarian sidereal astrologer of ancient astrology who gained her doctoral degree in cross-cultural communication from the UBI in Brussels, Belgium. She received her qualification in ancient Babylonian astrology from the astrologer, astrolab researcher and astronomer Rumen Kolev.

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