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
 
Property / instance of
 
Property / instance of: unit of time / rank
 
Normal rank