equatorialToLocalHorizontal {oce} | R Documentation |
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].
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. |
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 formulae for Calculators. Willmann-Bell. Richmond VA, USA. 201 pages.
2. Meeus, Jean, 1991. Astronomical algorithms. Willmann-Bell, Richmond VA, USA. 429 pages.
Other things related to astronomy: eclipticalToEquatorial
,
julianCenturyAnomaly
,
julianDay
, moonAngle
,
siderealTime
, sunAngle