CAACoordinateTransformation_Equatorial2Ecliptic: CAACoordinateTransformation_Equatorial2Ecliptic

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

Description

CAACoordinateTransformation_Equatorial2Ecliptic

Usage

CAACoordinateTransformation_Equatorial2Ecliptic(Alpha, Delta, Epsilon)

Arguments

Alpha	Alpha The right ascension expressed as an hour angle.
Delta	Delta The declination in degrees.
Epsilon	Epsilon The obliquity of the ecliptic in degrees.

Value

Returns the converted ecliptic coordinates in a CAA2DCoordinate class. The x value in the class corresponds to the ecliptic longitude in degrees and the y value corresponds to the ecliptic latitude 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. The transformation of coordinates from Equatorial to Ecliptic. This refers to algorithm 13.1 and 13.2 on page 93.

Examples

CAACoordinateTransformation_Equatorial2Ecliptic(Alpha = 12, Delta = 36, Epsilon = 23.33312)

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