Zodiac

It is possible to specify which zodiac is used for any chart calculations. Typically, western astrologers use the Tropical zodiac, which has its starting point where the Sun is when it crosses the equator northwards. However, many eastern astrologers use a sidereal zodiac which has a starting point which is fixed against the constellations, and is currently roughly 25-30 degrees earlier than the tropical zodiac’s starting point. The exact difference depends upon which ayanamsa which is used. An ayanamsa is the longitudinal difference between the Tropical zodiac and a Sidereal Zodiac. This difference changes with time, due to the precession of the equinoxes, but may be defined as a fixed difference at a specific date, such as 1st Jan 1900. There are certain standard ayanamsas that are used by astrologers, and the most common of these are available for selection from the menu. Any which are not on the menu may be selected by choosing the User Defined option.

You can select any of the available zodiac types by highlighting the desired option on the list of zodiac types.

•Tropical - Precessing vernal point - Normally used in western astrology

•Fagan-Bradley - Standard western astrologers' sidereal ayanamsa

•Lahiri - Official Indian government ayanamsa

•DeLuce - According to Robert DeLuce in "Constellational Astrology"

•Raman - According to B.V.Raman of India

•Usha-Shashi - According to Usha-Shashi in "Hindu Astrological Calculations"

•Krishnamurti - According to K.S.Krishnamurti

•Djwhal Khul - According to the Tibetan Djwhal Khul, derived from information in Alice Bailey’s "Esoteric Astrology"

•Draconic - Based on position of the moon’s north node

•User Defined - Allows you to enter your own ayanamsa in terms of the position of the Synetic Vernal Point at 1st January 1900 for that ayanamsa. Angles may be entered in degrees, minutes and seconds (e.g. "334 27 32") or using zodiacal sign (e.g. "4 Pi 27 32"). See Entering Angles for more information on entering angles.