oce (version 1.1-1)

equatorialToLocalHorizontal: Convert equatorial to local horizontal coordinate

Description

Convert from equatorial coordinates to local horizontal coordinates, i.e. azimuth and altitude. The method is taken from equations 8.5 and 8.6 of [1], or, equivalently, from equations 12.5 and 12.6 of [2].

Usage

equatorialToLocalHorizontal(rightAscension, declination, t, longitude,
  latitude)

Arguments

rightAscension

right ascension, e.g. calculated with eclipticalToEquatorial.

declination

declination, e.g. calculated with eclipticalToEquatorial.

t

time of observation.

longitude

longitude of observation, positive in eastern hemisphere.

latitude

latitude of observation, positive in northern hemisphere.

Value

A data frame containing columns altitude (angle above horizon, in degrees) and azimuth (angle anticlockwise from south, in degrees).

References

1. Meeus, Jean, 1982. Astronomical formulae for Calculators. Willmann-Bell. Richmond VA, USA. 201 pages.

2. Meeus, Jean, 1991. Astronomical algorithms. Willmann-Bell, Richmond VA, USA. 429 pages.

See Also

Other things related to astronomy: eclipticalToEquatorial, julianCenturyAnomaly, julianDay, moonAngle, siderealTime, sunAngle