Chart basics · Beginner
Birth time
Also called time of birth
The clock time of birth, which the Ascendant, houses and the Moon's exact degree depend on.
The Ascendant moves through a whole sign in about two hours on average, and the Moon about half a degree an hour, so the birth time changes a chart more than anything else. This site asks how sure the time is: exact, approximate (with a range) or unknown, and shows what changes within the stated range instead of pretending to precision.
Sources
Written for Cool Moon Facts in its own words. An astrology source documents what astrologers believe or practise; it does not establish that astrology works.