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| abstraction > mathematical concept > unit > time unit > year > calendar year |
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| calendar year comparison table | ||||
| Subject | is an instance of | see also | is a kind of | has definition |
|---|---|---|---|---|
| year | time unit | A period of time based on the revolution of the Earth around the Sun. | ||
| calendar year | year | Gregorian calendar | is an approximation to the tropical year. |
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