...almanacs. The epoch from which ET is measured is 1900 January 0-5 [ET], more elaborately denned in 1958 as "the instant near the beginning of the calendar year AD 1900 when the mean longitude of the sun was 279° 41' 48" -04, at which instant the measure of ET was 1900 January...

...mean noon, but which actually is 1900 January 0 day 12 hours ET; the instant to which this designation is assigned is the instant near the beginning of the...geometric mean longitude of the Sun referred to the mean equinox of date was 279 degrees 41 minutes 48.04 seconds. Ephemeris time is the measure of time in...

...mean noon, but which actually is 1900 January 0 day 12 hours ET; the instant to which this designation is assigned is the instant near the beginning of the...geometric mean longitude of the Sun referred to the mean equinox of date was 279 degrees 41 minutes 48.04 seconds. Ephemeris time is the measure of time in...

...almanacs. The epoch from which ET is measured is 1900 January 0-5 [ET], more elaborately defined in 1958 as "the instant near the beginning of the calendar year AD 1900 when the mean longitude of the sun was 279° 41' 48"-04, at which instant the measure of ET was 1900 January...

...adopted the following definition for the epoch of ephemeris time: "Ephemeris time is reckoned from the instant, near the beginning of the calendar year...1900, when the geometric mean longitude of the Sun was 279°41'48?04, at which instant the measure of ephemeris time was 1900 January 0"12" precisely."...

...were adopted. RESOLUTIONS Ephemeris Time (ET), or Temps des Ephémérides (Т.Е.), is reckoned from the instant, near the beginning of the calendar year...1900, when the geometric mean longitude of the Sun was 279° 41' 48*04, at which instant the measure of Ephemeris Time was 1900 January od i2h precisely....