Cool Moon Facts by Whip

Real astronomy and dated history, with sources. Documented traditions and folklore. Modern lunar astrology · symbolic, not predictive.

Chart basics · Advanced

Julian Day

Also called Julian date, JD, JD

A continuous count of days used by astronomers, so that dates can be subtracted without calendars.

Julian Day 2451545.0 is noon on 1 January 2000. The site's “show the math” panel gives the Julian Day of a chart so it can be checked against other software.

  • Kind: Astronomy, Calculation
  • Tradition: Astronomy
  • In this site’s birth chart: used

Related: Coordinated Universal Time, Delta T, Ephemeris

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.

All terms · Your birth chart

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