CAAParallax_Equatorial2Topocentric: CAAParallax_Equatorial2Topocentric

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

Description

CAAParallax_Equatorial2Topocentric

Usage

CAAParallax_Equatorial2Topocentric(Alpha, Delta, Distance, Longitude, Latitude, Height, JD)

Arguments

Alpha	Alpha The right ascension in hours of the object at time JD.
Delta	Delta The declination in degrees of the object at time JD.
Distance	Distance The distance (in astronomical units) to the Earth.
Longitude	Longitude The longitude in degrees.
Latitude	Latitude The latitude in degrees.
Height	Height The observer's height above sea level in meters
JD	JD The date in Dynamical time to calculate for.

Value

Returns the converted equatorial coordinates in a CAA2DCoordinate class. The x value in the class corresponds to right ascension expressed as an hour angle and the y value corresponds to the right ascension in degrees.

Note

This returns the rigorous conversion between the geocentric and topocentric values. This refers to equation 40.2 and 40.3 on page 279.

Author(s)

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

References

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

Examples

CAAParallax_Equatorial2Topocentric(Alpha = 12.5, Delta = 35, 
   Distance = 0.02, Longitude = 150, Latitude = 67, Height= 5300, JD = 2456597.5)

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