Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1959
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959natur.184..441m&link_type=abstract
Nature, Volume 184, Issue 4684, pp. 441-442 (1959).
Astronomy and Astrophysics
Astronomy
Scientific paper
THE ellipticity of the Earth causes perturbations of the elements of the Moon's orbit with a period of 18.6 years. The value of the ellipticity used in Brown's ``Tables of the Motion of the Moon'' and in the ``Improved Lunar Ephemeris'' is 1/294. As has been pointed out elsewhere1, the correction to be applied to the tabular longitude of the Moon in order to reduce it to ellipticity 1/297 is equal to -0.149'' sin Ω, where Ω is the longitude of the Moon's node. This is equivalent to a correction of + 0.271 s. sin Ω to ΔT as defined by the International Astronomical Union2. Recent observations of artificial Earth satellites indicate that the true value of the ellipticity may be nearer 1/298 (ref. 3), in which case the correction to be applied to ΔT is + 0.36 s. sin Ω.
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