SUNALTAZI Name
SUNALTAZI Purpose
Compute sun position from date/time and long/lat.
Category
Calling Sequence
sunaltazi, time, lng, lat, azi, alt Inputs
time=t Date and time string or double in
precision Julian Seconds.
lng, lat = Longitude and latitude. May be arrays. in
Keyword Parameters
Keywords
ZONE=hrs Hours ahead of GMT (def=0). Ex: zone=-4 for EDT.
SUBLNG=lng Subsolar point longitude (deg).
SUBLAT=lat Subsolar point latitude (deg).
/NOREFRACT Means return true altitude, not refracted.
ERROR=err Time error flag (0=ok).
Outputs
azi, alt = corresponding solar azimuth and altitude out
at given points. Altitude is refracted, not actual.
Common Blocks
Notes
Note: true alt returned unrefracted if it is < -1 deg.
Modification History
R. Sterner, 1995 Dec 13
R. Sterner, 1998 Jan 19 --- Renamed from sunpos to avoid conflict
with a routine of the same name in the IDLASTRO library from GSFC.
R. Sterner, 2001 Jan 24 --- Added /NOREFRACT.
R. Sterner, 2004 Jan 07 --- Fixed a bug for multiple times.
R. Sterner, 2010 May 04 --- Converted arrays from () to [].
Copyright (C) 1995, Johns Hopkins University/Applied Physics Laboratory
This software may be used, copied, or redistributed as long as it is not
sold and this copyright notice is reproduced on each copy made. This
routine is provided as is without any express or implied warranties
whatsoever. Other limitations apply as described in the file disclaimer.txt.