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Year, Besselian
The period of one complete revolution in right ascension of the mean Sun as defined by Newcomb. This definition has not been used since 1984. This year begins when the right ascension of the Sun is exactly 240 degrees. |
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Year, sidereal
The interval of time between two successive passages of the Sun, using as a reference point a fixed star. Equivalent to 365.2564 MSD. |
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Year, tropical
The interval of time between two successive passages of the Sun, using as a reference point the first point of Aries. Without other qualifying adjectives, the term "year" means tropical year. Equivalent to 365.242191 MSD. |
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Zone time
The time, originally in whole number hours before or after UT, which is adopted by agreement as the local civil time. |
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