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юлиандық жыл

Exactly 365. 25 days, in which a century (100 years) is exactly 36525 days and in which 1900. 0 corresponds exactly to 1900 January 0. 5 (from the Julian-date system, which is half a day different from civil time or UT). The standard epoch J2000. 0, now used for new star-position catalogues and in solar-system-orbital calculations, means 2000 Jan. 1. 5 Barycentric Dynamical Time (TDB) = Julian Date 2451545. 0 TDB. When this dynamical, artificial "Julian year" is employed, a letter "J" prefixes the year.

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The year of mourning after the burial of a parent.

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Astronomie; Allgemeine Astronomie

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Star with spectral type A in which the spectrum of the Balmer lines of hydrogen attain their greatest strength. Helium lines can no longer be seen. Some metallic lines are ...

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the light produced by excited atoms and ions in the upper atmosphere of a planet

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