Tropical zodiac

The tropical zodiac divides the Sun's path into twelve equal signs of 30 degrees, counted from the March equinox. It follows the seasons rather than the stars, and it is the frame most Human Design and astrology software uses. Because of precession, its signs and the constellations that share their names have drifted about a sign's width apart. This app reads charts against the constellations instead, and keeps the tropical calculation as a reference.