tropical year

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tropical year

tropical year time between successive vernal equinoxes ; 365 days, 5 hr, 48 min, 46 sec of mean solar time (see solar time ). The tropical year is the basis of the year used in the Gregorian calendar .

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tropical year

A Dictionary of Astronomy | 1997 | Â© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

tropical year The interval of time between successive passages of the Sun through the mean equinox. This differs slightly from the period of the Earth's revolution around the Sun, since the equinox itself moves continually due to precession. The length of the tropical year is 365.242 19 days. This is the exact period over which the seasons recur, so it is the length of the year that must be matched by a solar calendar.

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The Oxford American College Dictionary | 2009 | © The Oxford American College Dictionary 2009, originally published by Oxford University Press 2009. (Hide copyright information) Copyright

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