CAAParallax_Equatorial2TopocentricDelta: CAAParallax_Equatorial2TopocentricDelta

Description Usage Arguments Value Note Author(s) References Examples

View source: R/CAAParallax_Equatorial2TopocentricDelta.R

Description

CAAParallax_Equatorial2TopocentricDelta

Usage

1
CAAParallax_Equatorial2TopocentricDelta(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 corrections in equatorial coordinates in a CAA2DCoordinate class. The x value in the class corresponds to the correction in right ascension expressed as an hour angle and the y value corresponds to the correction in declination in degrees.

Note

This returns the difference between the geocentric and topocentric values. This refers to equation 40.4 and 40.5 on page 280.

Author(s)

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

References

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

Examples

1
CAAParallax_Equatorial2TopocentricDelta(Alpha = 2.12, Delta = 35, Distance = 0.17, Longitude = 124, Latitude = 40, Height = 3200, JD = 2456597.5)

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