Do you wait to make an important decision before reading your horoscope? Have you ever turned down a date because your zodiac signs weren’t compatible? Do you have a little tattoo of your zodiac sign on your ankle?
NASA recently revealed that there are actually 13 zodiac signs, and now everything you ever knew about your horoscope has changed.
Here’s what happened.
3,000 years ago, astronomers didn’t totally understand how the Earth, sun, and stars moved. They also didn’t realize how vast the universe is.
At this time, the Babylonians already developed a 12-month calendar (based on the phases of the moon). So they divided the sky into 12 equal parts by looking at 12 distinct constellations by which the sun appeared to travel over the course of a year, according to NASA.
“But even according to the Babylonians’ own ancient stories, there were 13 constellations in the zodiac,” NASA report.
So they decided to pick one, Ophiuchus, to leave out in order to make a tidy match with their 12-month calendar.
“The Babylonians ignored the fact that the sun actually moves through 13 constellations, not 12. Then they assigned each of those 12 constellations equal amounts of time,” according to NASA.
NASA decided to do the math and incorporate Ophiuchus into the zodiac sign chart.
Capricorn: Jan. 20 to Feb. 16
Aquarius: Feb. 16 to March 11
Pisces: March 11 to April 18
Aries: April 18 to May 13
Taurus: May 13 to June 21
Gemini: June 21 to July 20
Cancer: July 20 to Aug. 10
Leo: Aug. 10 to Sept. 16
Virgo: Sept. 16 to Oct. 30
Libra: Oct. 30 to Nov. 23
Scorpio: Nov. 23 to Nov. 29
Ophiuchus: Nov. 29 to Dec. 17
Sagittarius: Dec. 17 to Jan. 20