J2000 to B1950 coordinate converstion
Precession from J1950 to B2000
j2b(ra = "17:30:30", dec = "-28:47")
J2000 Right ascention (string)
J2000 Declination (string)
Enter positions as text strings with fields separated by characters d, h, m, s, a colon, or a comma, e.g. '17, 42, 28', '-28h43m03s', or '- 28 :43 : 3'. Spaces are removed in input conversion. Trailing missing values are taken as zero. The code uses an approximate formula for precession; spot checks give results accurate within a few tenths of an arcsecond.
List with strings in:
B1950 Right ascension
Values based on power-law expansion of more exact calculation.
Explanatory supplement to the Astronomical Almanac, Seidelmann (ed.), c.~1992, chapter 3.213
hms2rad for input conversions.
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