TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

EPHEMERIS SECOND [1 record]

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Record 1 1977-09-09

English

Subject field(s)
  • Astronomy
OBS

An "ephemeris second" is equal to the length of 1 mean solar second at the beginning of the year 1900 (strictly, an ephemeris second is 1/31,556,925.97474 of the length of the "tropical" year at that date).

French

Domaine(s)
  • Astronomie
OBS

En octobre 1956, le Comité international des poids et mesures a adopté que la seconde est une 1/31 556 925,9747 partie de l'année tropique dont la durée dans le système du temps des éphémérides était en 1900 de 365,2421988 jours solaires moyens. [...] Sous cette définition, la seconde a reçu le nom de «seconde éphéméride».

Spanish

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