Early astronomers witnessed the Sun passing through the Zodiac signs in a year’s time, spending roughly a month in each. As a result, they determined that each constellation covers 30 degrees of the ecliptic.
However, due to a phenomenon known as precession, the positions of the constellations we see now have changed.
The zero point of the Zodiac used to designate the beginning day of spring in the Northern Hemisphere. The vernal equinox happens when the ecliptic and celestial equator collide, according to astronomers.
The zero point existed in Aries around 600 BCE, and it was known as the “first point of Aries.” (See Figure 1). The constellation Aries covered the first 30 degrees of the ecliptic; Taurus covered the next 30 degrees; Gemini covered the next 60 degrees; and so on for all twelve constellations of the Zodiac.
The Earth wobbles around its axis in a 25,800-year cycle, which ancient astrologers were unaware of. The gravitational attraction of the Moon on Earth’s equatorial bulge causes this wobble, which is known as precession.
This wobble has led the junction point between the celestial equator and the ecliptic to migrate west along the ecliptic by 36 degrees, or nearly one-tenth of the way around, over the past two and a half millennia. This indicates that, in relation to the stars beyond, the signs have moved a tenth of the way across the sky to the west, or about a month.
For example, persons born between March 21 and April 19 are considered Aries. During much of that time, the Sun was no longer in the constellation of Aries. The Sun is actually in the constellation of Pisces from March 11 to April 18! (See Illustration 2) See also Figure 3, which depicts the equinox precession from 600 BCE to 2600 CE.
The dates when the Sun is truly within the astronomical constellations of the Zodiac, as defined by contemporary constellation borders and corrected for precession, are listed in the table below (these dates can vary a day from year to year).
When precession is taken into consideration, your zodiac sign will most likely be different. And if you were born between November 29 and December 17, your zodiac sign is one you’ve never heard of before: Ophiuchus! After Scorpius, the eliptic crosses across the constellation of Ophiuchus.
Check out your “actual” zodiac sign below, and visit the Birthday Sky program to see what the sky looked like on your birthday.
In This Article...
What method do you use to determine your zodiac year?
Read about the remaining of your year of birth after you’ve divided it by 12. If the year’s number can be split without leaving a remainder, the remainder should be 0. Each of the remaining numbers corresponds to a different animal sign.
What is the name of the zodiac sign?
The zodiac is a belt-shaped section of the sky that stretches approximately 8 degrees north or south of the ecliptic, the apparent path of the Sun across the celestial sphere over the course of the year (as measured in celestial latitude). The Moon’s and visible planets’ courses are all within the zodiac belt.
The zodiac is divided into twelve signs in Western astrology, and formerly astronomy: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces. Each sign occupies 30 degrees of celestial longitude and roughly corresponds to the star constellations: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn
These astrological signs make up a celestial coordinate system, or more specifically, an ecliptic coordinate system, in which the ecliptic serves as the origin of latitude and the vernal equinox serves as the origin of longitude.
Aries, who should you marry?
Libra (opposites attract), Sagittarius, and Leo are the most compatible signs for Aries in friendship and romantic relationships (fellow fire signs will speak their same passionate language).
What is the order of the 12 zodiac signs?
Did you know that the night sky has 88 constellations? Humans have cataloged and labeled them all over the period of thousands of years. However, only 12 are exceptionally well-known and continue to play a role in modern astrological systems. The zodiac signs are a set of 12 constellations that correlate to the various months of the year.
Starting with the vernal equinox one of the crossings of the ecliptic with the celestial equator each of these occupys a sector of the sky that makes up 30 of the ecliptic. Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces are the astrological signs in the following order: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces. Here is a list of all the zodiac signs and their associated dates. Your zodiac sign is determined by your birthdate falling inside one of those dates.
Granted, current science has proven astrology to be an ancient fallacy, a method of correlating celestial motions to events and behaviors on Earth. However, given their lack of understanding of human psychology, astronomy, and the reality that Earth was not the center of the universe, such patterns were vital for ancient humans.