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 reference 1, or, equivalently, from equations 12.5 and 12.6 of reference 2.
equatorialToLocalHorizontal(
rightAscension,
declination,
t,
longitude,
latitude
)
right ascension, e.g. calculated with
eclipticalToEquatorial()
.
declination, e.g. calculated with
eclipticalToEquatorial()
.
time of observation.
longitude of observation, positive in eastern hemisphere.
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).
Meeus, Jean, 1982. Astronomical formulae for Calculators. Willmann-Bell. Richmond VA, USA. 201 pages.
Meeus, Jean, 1991. Astronomical algorithms. Willmann-Bell, Richmond VA, USA. 429 pages.
Other things related to astronomy:
eclipticalToEquatorial()
,
julianCenturyAnomaly()
,
julianDay()
,
moonAngle()
,
siderealTime()
,
sunAngle()
,
sunDeclinationRightAscension()