ephemeris time การใช้

• There also is Ephemeris time, which may include overlapping information.
• D Brouwer suggested the name'ephemeris time '.
• The length of second so defined was practically equal to the second of ephemeris time.
• In view of the fluctuation term, practical determination of the difference between ephemeris time and UT depended on observation.
• When ephemeris time was first adopted, time scales were still based on astronomical observation, as they always had been.
• Clemence's formula, now superseded by more modern estimations, was included in the original conference decision on ephemeris time.
• In this way, decisions made by the original designers of ephemeris time influenced the length of today's mean solar time.
• The difference between Terrestrial Time ( TT ) ( the successor to ephemeris time ) and atomic time was later defined as follows:
• He developed the ephemeris time scale, which had been adopted by the Hz, was used to define the second internationally since 1967.
• A detailed proposal of this kind was published in 1948 and adopted by the IAU in 1952 ( see Ephemeris time-history ).
• The TT subscript indicates that for this formula, the Julian date should use the Terrestrial Time scale, or its predecessor, ephemeris time.
• As UT is slightly irregular in its rate, astronomers introduced Ephemeris Time, which has since been replaced by Terrestrial Time ( TT ).
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• This was in conformity with the ephemeris time scale adopted by the Brown's Tables of the Moon ( used from 1923 through 1983 ).
• After the caesium atomic clock was invented, such clocks were used increasingly from the late 1950s as secondary realizations of ephemeris time ( ET ).
• For continuity with its predecessor Ephemeris Time, TCB was set to match ET at around Julian Date 2443144.5 ( 1977-01-01T00Z ).
• For continuity with its predecessor Ephemeris Time, TCG was set to match ET at around Julian Date 2443144.5 ( 1977-01-01T00Z ).
• By the middle of the 20th century, the difference between Universal and Ephemeris Time had been recognised and evaluated, and the troublesome empirical terms were removed.
• In the meantime, Brown's theory was improved with better constants and the introduction of Ephemeris Time and the removal of some empirical corrections associated with this.
• For continuity with their predecessor Ephemeris Time ( ET ), TT and TCG were set to match ET at around Julian Date ( 1977-01-01T00Z ).