equatorialToLocalHorizontal {oce} | R Documentation |
Convert from equatorial coordinates to local horizontal coordinates, i.e. azimuth and altitude.
equatorialToLocalHorizontal(rightAscension, declination, t, longitude, latitude)
rightAscension |
right ascension, e.g. calculated with |
declination |
declination, e.g. calculated with |
t |
time of observation. |
longitude |
longitude of observation, positive in eastern hemisphere. |
latitude |
latitude of observation, positive in northern hemisphere. |
The method is taken from equations 8.5 and 8.6 of [1], or, equivalently, from equations 12.5 and 12.6 of [2].
A data frame containing columns altitude
(angle above horizon, in
degrees) and azimuth
(angle anticlockwise from south, in degrees).
Dan Kelley, based on formulae in [1] and [2].
1. Meeus, Jean, 1982. Astronomical formuae for Calculators. Willmann-Bell. Richmond VA, USA. 201 pages.
2. Meeus, Jean, 1991. Astronomical algorithms. Willmann-Bell, Richmond VA, USA. 429 pages.