sunRiseSet( lat, lng, UTCoff, date, PLOT)

Compute accurate apparent sunrise, sunset and noon times in seconds, and solar angles

Compute refraction-corrected sunrise, sunset and noon times in seconds at a given latitude, longitude and date.
Compute solar elevation, azimuthal and declination angles of the sun at every second of the day.

The code is also hosted on github.com/rdroste/sunRiseSet

USAGE:
sun_rise_set = sunRiseSet( lat, lng, UTCoff, date) Computes the *apparent* (refraction
corrected) sunrise and sunset times in seconds from mignight and returns them as
sun_rise_set. lat and lng are the latitude (+ to N) and longitude (+ to E), UTCoff is the
timezone, i.e. the local time offset to UTC (Coordinated Universal Time) in hours, and date is
the date in format 'dd-mmm-yyyy' ( see below for an example).

[sun_rise_set, noon] = sunRiseSet( lat, lng, UTCoff, date) additionally returns the solar noon
in seconds from midnight.

[sun_rise_set, noon, opt] = sunRiseSet( lat, lng, UTCoff, date) additionally returns the
information opt, which contains information on every second of the day:
opt.elev_ang_corr : Apparent (refraction corrected) solar elevation in degrees
opt.azmt_ang : Solar azimuthal angle (deg cw from N)
opt.solar_decl : Solar declination in degrees

sun_rise_set = sunRiseSet( ..., PLOT) If PLOT is true, plots of the elevation and azimuthal
angle are created.

EXAMPLE:
lat = 47.377037; % Latitude (Zurich, CH)
lng = 8.553952; % Longitude (Zurich, CH)
UTCoff = 2; % UTC offset
date = '15-jun-2017';

[sun_rise_set, noon, opt] = sunRiseSet( lat, lng, UTCoff, date, 1);

Richard Droste

Reverse engineered from the NOAA Excel:
(https://www.esrl.noaa.gov/gmd/grad/solcalc/calcdetails.html)

The formulas are from:
Meeus, Jean H. Astronomical algorithms. Willmann-Bell, Incorporated, 1991.