Learn
The parts of a chart: signs, houses, planets and aspects. What each one does, and how it is known.
37 pieces
Four fundamentals
The Sun sign is set by the calendar date; the rising sign is set by the exact minute and place. They move at a ratio of roughly fifteen to one, which is the entire reason they agree only about one time in twelve.
The Moon moves about thirteen times faster than the Sun, so its sign changes every two to three days rather than once a month. What that speed actually requires to compute, and what it does not require.
A transit is the same aspect arithmetic a natal chart uses, run between where the sky is today and where it was at birth. The orbs are narrower, self-contact is kept rather than skipped, and the four chart angles are not part of it yet.
An aspect is only counted when two bodies sit within a stated tolerance of an exact angle, and that tolerance is the orb. Lizastro uses 8 degrees for a conjunction or opposition and less for every smaller angle, and the tolerance narrows the same amount a user is allowed to narrow it.
The twelve signs
The dates are approximate. The moment the Sun changes sign shifts by up to a day and a half from year to year; if you were born near a boundary, calculate your chart.
Dates, with their times.
See what you read in your own chart.
The pieces are general; your chart is not. It takes sixty seconds to build — then read the pieces against your own placements.