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
2026 09 12 11:00     -1.00000  109.00042  -19.00042   67.22757
2026 09 12 12:00     -1.00000   98.05981   -8.05981   77.75017
2026 09 12 13:00     13.49337   86.68463    3.31537   87.50017
2026 09 12 14:00      3.85328   75.22487   14.77513   97.26539
2026 09 12 15:00      2.27188   64.02884   25.97116  107.88609
2026 09 12 16:00      1.67948   53.55673   36.44327  120.43184
2026 09 12 17:00      1.40118   44.54559   45.45441  136.32978
2026 09 12 18:00      1.27128   38.20415   51.79585  156.95556
2026 09 12 19:00      1.23590   36.06148   53.93852  181.62570
2026 09 12 20:00      1.28259   38.84365   51.15635  205.94119
2026 09 12 21:00      1.42803   45.63436   44.36564  225.89456
2026 09 12 22:00      1.73491   54.90568   35.09432  241.24553
2026 09 12 23:00      2.39912   65.51906   24.48094  253.44876
2026 09 13 00:00      4.27984   76.78734   13.21266  263.88531
2026 09 13 01:00     19.19307   88.27470    1.72530  273.58294
2026 09 13 02:00     -1.00000   99.64050   -9.64050  283.36484
2026 09 13 03:00     -1.00000  110.52982  -20.52982  294.02459
2026 09 13 04:00     -1.00000  120.47074  -30.47074  306.45675
2026 09 13 05:00     -1.00000  128.75733  -38.75733  321.65297
2026 09 13 06:00     -1.00000  134.37661  -44.37661  340.26094
2026 09 13 07:00     -1.00000  136.23251  -46.23251    1.44770
2026 09 13 08:00     -1.00000  133.85406  -43.85406   22.43251
2026 09 13 09:00     -1.00000  127.83538  -37.83538   40.61400
2026 09 13 10:00     -1.00000  119.29404  -29.29404   55.41568
2026 09 13 11:00     -1.00000  109.20729  -19.20729   67.58036

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