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Bessel's day numbers
plural noun
variants: or
Bessel's star numbers
Definition of Bessel's day numbers
: four numbers, A, B, C, D, constant for all stars, whose logarithms are tabulated for different dates and used in calculating the apparent change in right ascension and declination for any date from any date
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Origin and Etymology of bessel's day numbers
after F. W. Bessel
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