Do Zodiac Signs Change According to NASA and Astronomical Data
NASA states that the zodiac calendar is based on the Sun's apparent path through constellations over the year, and the agency does not change astrological signs. The Babylonians originally divided the ecliptic into 12 equal 30-degree segments aligned with their 12-month calendar, omitting the 13th constellation Ophiuchus. Astronomical positions of constellations have shifted due to axial precession, a slow wobble in Earth's rotation that completes a cycle roughly every 25,772 years. NASA's educational pages explain that zodiac signs in popular astrology are not the same as astronomical constellations and do not change with these shifts. For background on the astronomical basis, see NASA Science.
Astrological systems such as Western tropical astrology use the vernal equinox as the starting point for Aries, which is tied to the seasons rather than the stars. Sidereal astrology, used in Vedic traditions, aligns signs with actual star positions and accounts for precession through a system called ayanamsa. The International Astronomical Union recognizes 88 official constellations, many of which overlap the ecliptic path unevenly. Despite these facts, mainstream astrological horoscopes and zodiac date ranges remain unchanged in most popular publications and apps. The Smithsonian Institution notes that the distinction between astronomy and astrology is important for public understanding of celestial science.
Ophiuchus and the 13-Sign Zodiac: What the Data Shows
The idea that zodiac signs change because of Ophiuchus gained attention in 2011 when a Minnesota Planetarium Society post went viral. Ophiuchus is a real constellation that the Sun passes through between November 29 and December 17, according to NASA's published constellation boundaries. However, NASA explicitly stated that it did not add or remove zodiac signs and that its original article was about the history of the zodiac calendar, not a change to astrological systems. The Babylonians chose 12 signs for mathematical convenience, not because every constellation on the ecliptic was included. For the full NASA clarification, see NASA.
Astrologers widely rejected the 13-sign model, noting that tropical astrology is season-based and does not use constellation boundaries. Vedic astrologers who use sidereal calculations already account for precession but still use 12 signs in their interpretive framework. The popularity of Ophiuchus discussions spikes every few years when media outlets publish articles about potential zodiac sign changes. No major astrological organization, such as the American Federation of Astrologers, has adopted a 13-sign system. The conversation remains a recurring topic in pop culture rather than a change in established astrological practice.
Will Zodiac Signs Change in 2025 and Beyond
There is no official announcement from NASA, the International Astronomical Union, or any major astrological organization that zodiac signs will change in 2025 or the near future. NASA's fact sheet on the zodiac clarifies that the dates for astrological signs have been stable for thousands of years within the tropical system. The precession of the equinoxes shifts the astronomical positions of constellations by about 1 degree every 72 years, but this does not alter the fixed date ranges used in horoscope columns. For current NASA data on Earth's axial tilt and precession, see NASA Science.
Astrology apps, newspaper horoscopes, and online calculators continue to use the traditional 12-sign system with fixed date ranges such as Aries from March 21 to April 19. The popularity of zodiac content remains high, with major platforms like