Why Did Astrology Signs Change
Astrology signs appear to change because of the slow wobble of Earth's axis, called precession. Over thousands of years, this shifts the sky positions of the constellations relative to the calendar dates used in Western zodiac systems.
Did NASA Change the Zodiac Signs
NASA did not change the zodiac signs. The agency simply updated constellation data to reflect astronomical reality. Media coverage of the constellation boundaries sparked widespread confusion about whether horoscope dates had shifted.
Why Western Astrology Dates Stay the Same
Western astrology still uses a symbolic calendar based on the seasons, not the exact star positions. Tropical astrology fixes the vernal equinox as the start of Aries, so the dates remain stable even as the sky slowly moves.
For a deeper look at the astronomical background, see the explanation from NASA Science.
