The Sidereal Zodiac measures the 12 zodiac signs relative to the fixed stars and constellations, rather than Earth's seasons.

The Sidereal Zodiac measures the 12 zodiac signs corresponding to the constellations, rather than Earth's seasons (as with the Tropical Zodiac).

Both the sidereal and tropical zodiacs measure the 12 signs in 30-degree segments, even though the corresponding constellations of each sign are not usually 30 degrees wide.

The sidereal zodiac is out of sync with Earth's seasons and with the tropical zodiac. For example, spring in the northern hemisphere (or fall in the southern hemisphere) begins at the Vernal Equinox, when the Sun appears to cross the equator (reaches 0° declination). This typically happens around March 20 each year.

However, whereas the Sun in the tropical zodiac is at 0° Aries at the vernal equinox, the Sun in the sidereal zodiac is at 5° Pisces. The sidereal Sun doesn't reach 0° Aries until around April 14 each year.

The gap between the tropical and sidereal zodiacs increases by about 1° every 72 years. This is also known as the Precession of the Equinoxes.

 Pronounced: Sid-DEER-ee-al or Sye-DEER-ee-al.

Marketplace is Open!

book and candle

Astrology Reports!

Natal • Forecast • Synastry • Composite • Art Charts • DayWatch Calendars

Written by Professional Astrologers, so you know it's the real deal. Beautifully formatted by Evolving Door Astrology. Buy it for yourself or give it as a gift.

* Check out our Combo Packages that are always 25% OFF the regular price!

Shop our Marketplace Now!

Subscribe!

Subscribe to our Newsletter to be notified of updates to the website.

Astrology Glossary Terms

Donate to Support Evolving Door Astrology

Thank you for helping to keep all this information free for everyone!

Donate in $CAD
Or Donate in $US

So, What Do Ya Think?

  • Have some feedback?
  • Compliments? Complaints?
  • Can't find something?
  • Report a problem?
  • Have a suggestion?
  • Just want to say Hi?

Then Contact Me! :-)