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leap second

subject fact

leap second has definition A second (see second, Système International) added between 60^s and 0^s at announced times to keep UTC within 0^s.90 of UT1. Generally, leap seconds are added at the end of June or December. has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:32:53.0
is an instance of second unit

time unit is a unit of time 2001-09-27 09:32:52.0

unit has historical origin 2001-09-27 09:32:42.0
represents

leap second	has definition A second (see second, Système International) added between 60^s and 0^s at announced times to keep UTC within 0^s.90 of UT1. Generally, leap seconds are added at the end of June or December.
leap second	is an instance of second unit
time unit	is a unit of time
unit	has historical origin
unit	represents