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The History Of Constellations: Where Do They Really Come From?

The dates mentioned in the newspaper’s horoscope indicate when the sun appears in a certain astrological sign. For example, the time between March 21 and April 19 is reserved for the Aries sign. But your astrological sign doesn’t necessarily tell you which zodiac sign the sun was in on the day you were born. A 2003 study conducted by former astrologer Dr. Geoffrey Dean and psychologist Dr. Ivan Kelly followed the lives of 2,000 subjects who were born minutes apart over several decades.

When the longitudes were given, they were expressed with reference to the 30° of the constellation, that is, not with a reference to the continuous ecliptic of 360°. In astronomical ephemeris, the positions of significant astronomical phenomena were calculated in sexagesimal fractions of one degree. For daily ephemeris, the daily positions of a planet were not as important as the astrologically significant dates when the planet crossed from one zodiac sign to another.

The constellations are the twelve 30° sections of the zodiac made by analogy with the old “ideal year” with equal months of 30 days. Most signs refer to living beings, the only exception beings is Libra, libra. In modern Western astrology, constellations are believed to affect human life in some way. Most of us, even those who are not so familiar with astronomy or astrology, know the 12 zodiac signs and the 12 associated constellations. This article explains why there is so much inconsistency in numbers and how constellations differ from constellations. Ptolemy quotes Hipparchus’ Now Lost Work entitled “On the Displacement of solstitial and equinoctial points” in the seventh book of his 2nd-century astronomical text, Almagest, where he describes the phenomenon of precession and estimates its value.

Ptolemy clarified that the convention of Greek mathematical astronomy was to start the zodiac from the point of the vernal equinox and always refer to this point as “the first degree” of Aries. This is known as the “tropical zodiac” (from the Greek word tropos, rotate) because the starting point rotates through the circle of background constellations over time. With the current boundaries, there are actually 13 constellations zodiac sign that lie along the path of the sun. The extra that does not appear in any horoscope is Ophiuchus, the Snake Bearer, who is located between Sagittarius and Scorpio. While the signs remain fixed relative to the solstices and equinoxes, the solstices and equinoxes shift westward relative to the constellations or background stars. The ecliptic is the apparent path of the sun against the background of the stars.

Like many other zodiac signs, Ophiuchus is usually not considered one of the signs of the zodiac. However, some astrologers consider Ophiuchus to be a 13th sign of the zodiac, as the sun passes through it throughout the year. If considered part of the zodiac, it would be placed before Sagittarius, as the sun usually passes through Ophiuchus from late November to mid-December. If you want to learn more about Ophiuchus and how NASA once accidentally caused an astrological controversy about it, you can check out our Ophiuchus profile. There is very little scientific evidence that astrology is an accurate predictor of personality traits, future fates, love lives, or anything else that mass-market astrology claims to know.