bessel's day numbers

bessel's day numbers
\\ˈbesəlz-\ noun plural or bessel's star numbers
Usage: usually capitalized B
Etymology: after F.W. Bessel
: 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

Useful english dictionary. 2012.

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