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On The Use of Mean Sidereal Time

1951; Oxford University Press; Volume: 111; Issue: 6 Linguagem: Inglês

10.1093/mnras/111.6.619

1365-2966

R. d'E. Atkinson, D. H. Sadler,

Astro and Planetary Science

Apparent right ascensions are at present reckoned from the computed position of the true equinox, and this computed position is also used to define sidereal time. Owing to nutation, both the right ascensions and the time so defined oscillate, and good modem clocks cannot readily indicate such time. In the observation of celestial bodies it is not the apparent right ascension itself that is involved but the hour angle, or difference between sidereal time and right ascension. It is now proposed to subtract the tabular nutation in right ascension from both these quantities, in all ephemerides. The tabulated sidereal time will then run uniformly, and the oscillations in right ascension of most celestial bodies will also be reduced. In addition to its advantages for a time service, the new arrangement will simplify a number of routine calculations. The question of a suitable name for the modified right ascension is discussed.