Most readers saw headlines saying NASA “changed the zodiac.” That is not what happened. The NASA zodiac controversy started when NASA explained the sky for kids and noted that the Sun passes through 13 constellations, including Ophiuchus. NASA studies astronomy, not astrology, and it did not change anyone’s birth sign.
NASA zodiac controversy: what really happened
In 2016, a short NASA blog for students explained that the ancient Babylonians chose 12 constellations for a 12‑month calendar, even though the Sun’s path crosses 13 constellations. NASA added that this does not affect science or daily life, because astrology is not science. The key point is simple: NASA did not “add” a sign or edit horoscopes; it only described how constellations work in the sky.
As a reminder of NASA’s focus on evidence, see our related explainer on how NASA confirms Mars cannot be terraformed with today’s tools. That story shows NASA’s role in testing ideas with data, not in setting beliefs.
Quick facts
- NASA studies stars and planets using physics and observation. Astrology is a belief system, not a tested science.
- The Babylonians used 12 signs for calendar reasons and left out Ophiuchus.
- Online claims about “new signs” resurface every few years, but NASA keeps saying the same thing: it did not change the zodiac.
Ophiuchus and the 13th sign claim
Ophiuchus is a star pattern on the ecliptic, the Sun’s yearly path. Ancient sky watchers knew it. They chose to keep a tidy 12‑sign system and left Ophiuchus out. That choice does not stop astronomers from naming or charting the constellation. It only shows that astrological signs are a cultural system, not a map that science updates.
What it means for horoscopes
If you enjoy horoscopes, you can keep doing so. The NASA note was not a rule for astrology. It was a basic sky lesson for students. Media and social posts turned that lesson into a claim about “new signs,” which is why the rumor keeps coming back.
Astronomy vs astrology: why NASA weighed in
Astronomy is a science. It follows the scientific method and relies on repeatable tests. Astrology is a belief that the positions of stars and planets say something about people’s lives. NASA explains the difference because many readers mix the two. Clarifying this helps students learn how evidence works.
Practical takeaway
When you read a claim about the sky, ask: is this astronomy (tested, measured) or astrology (belief, tradition)? This simple check helps filter viral posts.
Precession of the equinoxes: does it change your sign?
Earth slowly wobbles like a spinning top. This wobble is called precession. Over long periods, precession shifts the backdrop of stars behind the Sun at the equinoxes. Astronomers track that shift for navigation and timekeeping. Astrologers may handle it in their own systems. Either way, precession does not force NASA—or anyone—to change your personal birth sign, because astronomy and astrology use different rules.
A simple picture
- Precession is a slow, natural wobble of Earth’s axis.
- It changes where constellations appear over millennia.
- It matters to astronomy and calendars, but it does not mean NASA updates horoscopes.
Limits of the NASA zodiac debate and evidence
This topic is not a scientific dispute; it is a media misunderstanding. The evidence is clear about two points: which constellations the Sun crosses, and the difference between astronomy and astrology. There is no experiment that can validate horoscope predictions the way we test a physics claim. That is why NASA frames astrology as culture, not science.
NASA – Constellations and the calendar – 2016
NASA stated that it did not change any zodiac signs and simply did the math. The post explains that the Babylonians used 12 signs even though the Sun crosses 13 constellations, including Ophiuchus.
NASA Space Place – What are constellations? – 2016 (living page)
A NASA kids’ page explains astronomy vs astrology in plain language, noting that astrology is a belief system, not a science.
Reuters – False posts about NASA changing the zodiac resurface – 2021
A fact‑check confirms that social media claims about NASA “adding a 13th sign” are false. The piece cites NASA’s public statements.
CBS News – No, NASA has not discovered a new zodiac sign – 2020
A news report summarizes the rumor cycle and notes that NASA again clarified it had not created a new sign.
The Planetary Society – What is the difference between astronomy and astrology? – 2024
This explainer reviews the clear difference between a science and a belief system for general readers.
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