Solar Geom Calc

Solar Geometry Calculator
Latitude:	Longitude:	UTC Start Date:	UTC End Date:	Local Time Zone:	Interval (secs):

Local Date Format: Show GMT: Airmass: Solar Zenith Angle: Elevation: Azimuth:
Atmospheric Refraction Correction:

Local UTC     SolarZen and Elev Uncorrected for Atmospheric Refaction
yyyy MM dd HH:mm      AirMass   SolarZen       Elev       Azim
2025 07 16 09:00     -1.00000  113.20886  -23.20886   28.90008
2025 07 16 10:00     -1.00000  106.54355  -16.54355   41.96955
2025 07 16 11:00     -1.00000   98.05321   -8.05321   53.33851
2025 07 16 12:00     19.21939   88.28023    1.71977   63.35134
2025 07 16 13:00      4.55695   77.64468   12.35532   72.49605
2025 07 16 14:00      2.48872   66.46835   23.53165   81.33126
2025 07 16 15:00      1.74001   55.02450   34.97550   90.55518
2025 07 16 16:00      1.37934   43.61223   46.38777  101.25464
2025 07 16 17:00      1.18760   32.71517   57.28483  115.56568
2025 07 16 18:00      1.08962   23.47251   66.52749  138.22749
2025 07 16 19:00      1.05604   18.82736   71.17264  175.55038
2025 07 16 20:00      1.07807   22.01321   67.98679  215.37593
2025 07 16 21:00      1.16145   30.64186   59.35814  240.65451
2025 07 16 22:00      1.33026   41.33592   48.66408  256.15680
2025 07 16 23:00      1.64653   52.69973   37.30027  267.36083
2025 07 17 00:00      2.28352   64.17279   25.82721  276.77254
2025 07 17 01:00      3.90601   75.43673   14.56327  285.61773
2025 07 17 02:00     12.35183   86.22092    3.77908  294.64596
2025 07 17 03:00     -1.00000   96.21856   -6.21856  304.43539
2025 07 17 04:00     -1.00000  105.03298  -15.03298  315.49209
2025 07 17 05:00     -1.00000  112.14557  -22.14557  328.20783
2025 07 17 06:00     -1.00000  116.94072  -26.94072  342.66241
2025 07 17 07:00     -1.00000  118.84959  -28.84959  358.34983
2025 07 17 08:00     -1.00000  117.59934  -27.59934   14.17090
2025 07 17 09:00     -1.00000  113.37208  -23.37208   28.95337

Latitude:

-90.0 to +90.0, Negative for South, Positive for North.

Longitude:

-180.0 to +180.0, Negative for East, Positive for West.

Start Date:

Enter start date in the format yyyy-MM-dd HH:mm [UTC]

End Date:

Enter end date in the format yyyy-MM-dd HH:mm [UTC]

Interval:

The internal (in seconds) between successive solar calculations.

Date Format:

yy[yy] Format for years. Two or four digits.
M[MM] Format for months. MM=01-12, MMM=Jan-Dec, MMMM=January-December
d[d] Format for day of month. One or Two digits.
D[DD] Format for day-of-year. One to three digits (zero padded).
HH[or hh] Format for hour-of-day. HH=24 hr clock, hh=12 hr clock.
mm Format for minutes. mm=00-59.
ss Format for seconds. ss=00=59.
a AM/PM.
z Timezone Acronym.
Z Timezone hours offset. Examples: +0600, -0200

Examples:
yyyy/MM-dd_DDD hh:mm:ss aa
yyyyMMdd[DDD]HHmmss

Air mass

If the sun is below the horizon, Air mass = -1.0000. Toggle the checkbox to enable/disable column in report.

Air mass Calculation

Airmass = 1.0/(cos(90 - elev) + 0.50572 * (6.07995 + elev)^-1.6364)

Solar Zenith Angle

Solar elevation in Degrees from zenith (90°). Angles are corrected for atmospheric diffraction. Toggle the checkbox to enable/disable column in report.

Elevation:

Solar elevation in Degrees above horizon (0 degrees). Angles are corrected for atmospheric diffraction. Toggle the checkbox to enable/disable column in report.

Azimuth:

Sun azimuth, 0° = N, 90° = E, 180° = S, 270° = W. Toggle the checkbox to enable/disable column in report.

Solar Geometry Calculator