CAAMoonIlluminatedFraction_PositionAngle: CAAMoonIlluminatedFraction_PositionAngle

In helixcn/skycalc: Computational Astronomy in R based on PJ Naughter's AA+ library

Description

CAAMoonIlluminatedFraction_PositionAngle

Usage

CAAMoonIlluminatedFraction_PositionAngle(Alpha0, Delta0, Alpha, Delta)

Arguments

Alpha0	Alpha0 The geocentric right ascension of the Sun expressed as an hour angle.
Delta0	Delta0 The geocentric declination of the Sun in degrees.
Alpha	Alpha The geocentric right ascension of the object (e.g. the Moon) expressed as an hour angle.
Delta	Delta The geocentric declination of the object (e.g. the Moon) in degrees.

Value

the position angle of the midpoint of the illuminated limb of the object (the Moon) in degrees.

Author(s)

C++ code by PJ Naughter, imported to R by Jinlong Zhang

References

Meeus, J. H. (1991). Astronomical algorithms. Willmann-Bell, Incorporated.

Examples

CAAMoonIlluminatedFraction_PositionAngle(Alpha0 = 12.60, Delta0 = 33, Alpha =19.40, Delta = 33.20)

helixcn/skycalc documentation built on March 31, 2021, 5:45 a.m.