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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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History and Etymology for Bessel's day numbers

after F. W. Bessel

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