Astronomical day

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	See under Day.
	a period equal to the mean solar day, but beginning at noon instead of at midnight, its twenty-four hours being numbered from 1 to 24; also, the sidereal day, as that most used by astronomers.

See also: Astronomical Day

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No references found			Thanks to the Earth's erratic rotation, the countdown to 2009 lasted a moment longer as British physicists and official timekeepers around the world inserted a leap second to bring the most accurate atomic clocks in line with the astronomical day. Sydney's pyrotechnic spectacular is first by The Journal (Newcastle, England) To take into account the extra second added on to the end of 2008 to put the atomic clocks in line with the astronomical day, BBC radio sounded an extra seventh pip leading up to the hour mark. London Eye a ring of fire as Britain welcomes in 2009 by AFP / AFP European Edition The cold weather came despite the spring equinox, seen by some as the first day of spring, when the astronomical day and night are equal. Weathermen warn: Spring is on hold by Daily Post (Liverpool, England)			astrologically astrologist Astrologize astrology Astroloma Astroloma humifusum astromancy Astromantic Astrometeorology Astrometer astrometric binary astrometry astronaut astronautic astronautical astronautics astronavigation Astronium Astronium fraxinifolium astronomer Astronomer Royal Astronomian Astronomic astronomical astronomical clock Astronomical day astronomical distance Astronomical fractions astronomical telescope Astronomical time astronomical twilight astronomical unit astronomical year astronomically Astronomize astronomy astronomy satellite astronomy unit Astrophel astrophile astrophotography Astrophotometer Astrophotometry Astrophysical astrophysicist astrophysics Astrophyton Astrophyton muricatum Astropogon Astropogon stellatus Astroscope			Astronomical Almanac Astronomical and Geodetic Network Astronomical and Geodetic Point Astronomical Association of Jamaica astronomical atlas astronomical azimuth astronomical bearing astronomical camera Astronomical catalog Astronomical catalogue Astronomical Climate Astronomical clock Astronomical clock Astronomical Code Astronomical Colorimetry astronomical constants Astronomical coordinate Astronomical coordinate Astronomical coordinate system Astronomical coordinate systems Astronomical Council of the Academy of Sciences of the USSR Astronomical Data Analysis Center Astronomical Data Analysis Software and Systems Astronomical Data Centers Coordination Committee Astronomical Data Query Language astronomical date Astronomical day astronomical distance astronomical distance Astronomical distances Astronomical distances Astronomical dusk Astronomical dusk Astronomical dusk astronomical eclipse Astronomical ecliptic Astronomical ecliptic Astronomical Ephemeris Astronomical Ephemeris Astronomical Ephemeris astronomical equator Astronomical fractions Astronomical Geodesy Astronomical Image Database Astronomical image processing Astronomical image processing Astronomical Image Processing Software Astronomical Image Processing System Astronomical Image Processing Workshop Astronomical Information Processing System Astronomical Institute at the University of Bern Astronomical Institute of the Academy of Sciences of the Uzbek Soviet Astronomical Institutes of the University of Bonn Astronomical Instrument Markup Language Astronomical Instrumentation Software Framework astronomical instruments Astronomical Instruments and Devices

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