I heard there will be the 13th sign stars. Anyone can explain?!


Question:

I heard there will be the 13th sign stars. Anyone can explain?


Answers:

According to the boundaries for the constellations adopted by the International Astronomical Union in 1921, there are 13 signs of the zodiac instead of the usual 12; time from Ophiuchus the snake handler is usually included in time given to Scorpius. If you already know your astrological sign from reading an astrology column in a newspaper or from consultation with an astrologer, you may be surprised that few of these dates correspond to the dates listed in the newspaper's astrological column. Why? Generally, listed astrological signs and the dates given by most astrologers assume that you were born around 140 AD.

Claudius Ptolemy, an astronomer and astrologer-in his day there was no distinction between astronomy and astrology-around 140 AD compiled the Tetrabiblos, which even today remains the most important work on astrology to most astrologers, in the west. In the time of Ptolemy the study of the stars was already very ancient, and at least 40 of the currently generally accepted 88 constellations were already named. In fact, Ptolemy even knew about the precession of the equinoxes, since the vernal equinox (the first day of spring) in his time occurred at the beginning of Aries and not in the middle of the constellation Taurus, as it had many millennia before his time. Today, as was mentioned above, the first day of spring occurs when the sun is in Pisces, and the relative position of the sun on this date is slowly processing, or moving, into Aquarius.

Precession of the equinox is caused by the fact that the axis of the earth's rotation (which causes day and night) and the axis of the earth's revolution around the sun (which marks the passage of each year) are not parallel. They are 23 l/2 degrees away from lining up; that is, the earth's axis of rotation is tilted. This tilt also causes our seasons, a fact that Ptolemy did understand but that many people do not understand even today. Ptolemy understood that the rotation axis of the earth was slowly precessing, or moving in a circle, with an angular radius of 23 1/2 degrees with a period of around 26,000 years. He deduced this from comparisons of data taken by the ancient Sumerians 2,000 years before his time. He did not understand what was pushing the precession, but he did understand the motion. We now realize that the sun is rotating with a period of around 30 days and that this causes the sun to bulge at the equator, which causes a torque to be exerted on the top like motion of the earth's day and night cycle. There is also a small 18.6-year variation caused by the moon's orbit around the earth, and the moon also has a small effect on precession; however, the sun's equatorial bulge is the main cause of the precession of the equinox, which is why your sign listed in the newspaper, in most cases is removed by one sign from the modern, actual position of the sun at your birth.


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