Convert from ecliptical to equatorial coordinates, using equations 8.3 and 8.4 of , or, equivalently, equations 12.3 and 12.4 of .
longitude, in degrees, or a data frame containing
geocentric latitude, in degrees
obliquity of the ecliptic, in degrees
A data frame containing columns
declination both in degrees.
Dan Kelley, based on formulae in  and .
1. Meeus, Jean, 1982. Astronomical formuae for Calculators. Willmann-Bell. Richmond VA, USA. 201 pages.
2. Meeus, Jean, 1991. Astronomical algorithms. Willmann-Bell, Richmond VA, USA. 429 pages. The code is based on ; see help(moonAngle,"oce") for comments on the differences in formulae found in . Indeed,  is only cited here in case readers want to check the ideas of the formulae; DK has found that  is available to him via his university library inter-library loan system, whereas he owns a copy of .
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