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abstraction > mathematical concept > unit > time unit > second unit > leap second |
leap second comparison table |
Subject | is an instance of | is a kind of | has definition |
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second unit | time unit | ||
leap second | second unit | A second (see second, Système International) added between 60s and 0s at announced times to keep UTC within 0s.90 of UT1. Generally, leap seconds are added at the end of June or December. |
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