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Besselian element
subjectfact 
Besselian elementhas definition One of several quantities tabulated for the calculation of accurate predictions of an eclipse or occultation for any point on or above the surface of the Earth.has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:33:34.0
is a kind of orbital quantity2001-09-27 09:33:34.0
quantityhas unit2001-09-27 09:33:12.0
numberhas value2001-09-27 09:32:57.0