Item:Q21320: Difference between revisions
Created a new Item: annum, conventional fixed unit of time, derived of the SI system, equal to the mean duration of the tropic year independantly of the geographic location, estimated to 365.2422 fixed days of 86400 seconds, near from the mean year observed on ground |
Created claim: instance of (P2): unit of time (Q1652) |
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Property / instance of | |||
Property / instance of: unit of time / rank | |||
Normal rank |