heliocentric Julian date

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• Julian day — JDN redirects here. For the military IT system, see Joint Data Network. For the comic book character Julian Gregory Day, see Calendar Man. Not to be confused with Julian year (disambiguation). Julian day is used in the Julian date (JD) system of… …   Wikipedia

• HJD — Heliocentric Julian Date (Miscellaneous » Unit Measures) …   Abbreviations dictionary

• HJD — abbr. Heliocentric Julian Date …   Dictionary of abbreviations

• Timekeeping on Mars — Various schemes have been used or proposed to keep track of time and date on the planet Mars independently of Earth time and calendars. Mars has an axial tilt and a rotation period similar to those of Earth. Thus it experiences seasons of spring …   Wikipedia

• Copernican heliocentrism — Heliocentric model from Nicolaus Copernicus De revolutionibus orbium coelestium Copernican heliocentrism is the name given to the astronomical model developed by Nicolaus Copernicus and published in 1543. It positioned the Sun near the center of… …   Wikipedia

• Metonic cycle — Heliocentric Solar System In astronomy and calendar studies, the Metonic cycle or Enneadecaeteris (from Greek words for nineteen years) is a period of very close to 19 years which is remarkable for being very nearly a common multiple of the solar …   Wikipedia

• Nicolaus Copernicus — Copernicus redirects here. For other uses, see Copernicus (disambiguation). Nicolaus Copernicus …   Wikipedia

• Sun Ra — Infobox musical artist Name = Sun Ra Img capt = Sun Ra at the New England Conservatory of Music, February 27, 1992 Background = non vocal instrumentalist Birth name = Herman Poole Blount Alias = Sun Ra, Le Sony r Sun Ra Born = birth… …   Wikipedia

• Europe, history of — Introduction       history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… …   Universalium

• Equinox — This article is about the astronomical event when the sun is at zenith over the Equator. For other uses, see Equinox (disambiguation). For the same event happening on other planets and setting up a celestial coordinate system, see Equinox… …   Wikipedia

• Babylonian astronomy — According to Asger Aaboe, the origins of Western astronomy can be found in Mesopotamia, and all Western efforts in the exact sciences are descendants in direct line from the work of the late Babylonian astronomers.[1] Our knowledge of Sumerian… …   Wikipedia