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A year (from Old English ger; symbol y or sometimes a) is the time between two recurrences of an event related to the orbit of the Earth around the Sun. By extension, this can be applied to any planet for example, a "Martian year" is the time in which Mars completes its own orbit. Latin annum is from a base *at-no-. Both *ye-ro- and *at-no- are based on verbal roots expressing movement, *at- and *ey- respectively, both meaning "to go" generally. Latin annum has a cognate in Gothic aþnam "year". The Greek word for "year", ?t??, is cognate to Latin vetus "old", from PIE *wetus- "year" , also preserved in this meaning in Sanskrit vat-sa- "yearling (calf)". The SI prefixes may be applied to the year in English to form kiloyear, megayear, and so on. The form annum is preferred because it is language-neutral (hence kilo-annum, mega-annum, etc.). In such instances, the year in question is always the Julian year of exactly 365.25 days of 86400 seconds. A calendar year is the time between two dates with the same name in a calendar.
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