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 06 10 07:00     -1.00000  116.98488  -26.98488    0.14413
2026 06 10 08:00     -1.00000  115.41963  -25.41963   15.43272
2026 06 10 09:00     -1.00000  111.00000  -21.00000   29.66548
2026 06 10 10:00     -1.00000  104.23823  -14.23823   42.29610
2026 06 10 11:00     -1.00000   95.71968   -5.71968   53.32754
2026 06 10 12:00     11.77092   85.95476    4.04524   63.08685
2026 06 10 13:00      3.88197   75.34085   14.65915   72.03346
2026 06 10 14:00      2.28445   64.18433   25.81567   80.70321
2026 06 10 15:00      1.64827   52.74623   37.25377   89.78743
2026 06 10 16:00      1.32981   41.31376   48.68624  100.41005
2026 06 10 17:00      1.15815   30.36441   59.63559  114.91736
2026 06 10 18:00      1.07138   21.10764   68.89236  138.98139
2026 06 10 19:00      1.04494   16.94827   73.05173  180.36129
2026 06 10 20:00      1.07218   21.21826   68.78174  221.51539
2026 06 10 21:00      1.15994   30.51573   59.48427  245.37280
2026 06 10 22:00      1.33312   41.47590   48.52410  259.79509
2026 06 10 23:00      1.65439   52.90820   37.09180  270.38420
2026 06 11 00:00      2.29721   64.34012   25.65988  279.45762
2026 06 11 01:00      3.91834   75.48544   14.51456  288.12911
2026 06 11 02:00     12.04385   86.08265    3.91735  297.08609
2026 06 11 03:00     -1.00000   95.82415   -5.82415  306.86248
2026 06 11 04:00     -1.00000  104.31095  -14.31095  317.91531
2026 06 11 05:00     -1.00000  111.03145  -21.03145  330.56665
2026 06 11 06:00     -1.00000  115.40119  -25.40119  344.81073
2026 06 11 07:00     -1.00000  116.91260  -26.91260    0.09197

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