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the time of aphelion passage

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  • The Great Daylight 1972 Fireball — (or US19720810) is an Earth grazing meteoroid which passed within 57 kilometres of the surface of the Earth at 20:29 UTC on August 10 1972. It entered the Earth s atmosphere in daylight over Utah, United States (14:30 local time) and passed… …   Wikipedia

  • Equation of time — The equation of time is the difference over the course of a year between time as read from a sundial and time as read from a clock, measured in an ideal situation (ie. in a location at the centre of a time zone, and which does not use daylight… …   Wikipedia

  • Mercury in the fiction of Leigh Brackett — The planet Mercury appears frequently as a setting for many of the stories of Leigh Brackett, and Mercury and Mercurians are frequently mentioned in other stories of the Leigh Brackett Solar System. Brackett s Mercury shares some characteristics… …   Wikipedia

  • Solar time — On a prograde planet like the Earth, the sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant …   Wikipedia

  • celestial mechanics — the branch of astronomy that deals with the application of the laws of dynamics and Newton s law of gravitation to the motions of heavenly bodies. [1815 25] * * * Branch of astronomy that deals with the mathematical theory of the motions of… …   Universalium

  • Solar eclipse — A solar eclipse occurs when the Moon passes between the Sun and the Earth so that the Sun is wholly or partially obscured. This can only happen during a new moon, when the Sun and Moon are in conjunction as seen from the Earth. At least two and… …   Wikipedia

  • asteroid — asteroidal, adj. /as teuh royd /, n. 1. Also called minor planet. Astron. any of the thousands of small bodies of from 480 miles (775 km) to less than one mile (1.6 km) in diameter that revolve about the sun in orbits lying mostly between those… …   Universalium

  • Solstice — For other uses, see Solstice (disambiguation). UTC date and time of solstices and equinoxes[1] year Equinox Mar Solstice June Equinox Sept Solstice Dec day time day time day time day time 2004 20 …   Wikipedia

  • Comet — This article is about the astronomical object. For other uses, see Comet (disambiguation). Comet Hale– …   Wikipedia

  • Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics       Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity.       Computer scientist Manindra Agrawal of the… …   Universalium

  • comet — cometary /kom i ter ee/, cometic /keuh met ik/, cometical, adj. cometlike, adj. /kom it/, n. Astron. a celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and… …   Universalium

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