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 12 09:00     -1.00000  112.60392  -22.60392   28.73344
2025 07 12 10:00     -1.00000  105.97348  -15.97348   41.70247
2025 07 12 11:00     -1.00000   97.52336   -7.52336   53.00198
2025 07 12 12:00     17.08205   87.78804    2.21196   62.96270
2025 07 12 13:00      4.40347   77.18320   12.81680   72.05970
2025 07 12 14:00      2.44624   66.02771   23.97229   80.84100
2025 07 12 15:00      1.72159   54.59134   35.40866   89.99561
2025 07 12 16:00      1.36929   43.16704   46.83296  100.60404
2025 07 12 17:00      1.18120   32.22673   57.77327  114.81925
2025 07 12 18:00      1.08496   22.89788   67.10212  137.55466
2025 07 12 19:00      1.05216   18.19620   71.80380  175.72919
2025 07 12 20:00      1.07431   21.51008   68.48992  216.41944
2025 07 12 21:00      1.15710   30.27556   59.72444  241.67928
2025 07 12 22:00      1.32419   41.03531   48.96469  257.00894
2025 07 12 23:00      1.63610   52.41942   37.58058  268.08202
2025 07 13 00:00      2.26046   63.88597   26.11403  277.40706
2025 07 13 01:00      3.82894   75.12503   14.87497  286.19501
2025 07 13 02:00     11.59530   85.86964    4.13036  295.18271
2025 07 13 03:00     -1.00000   95.81489   -5.81489  304.93656
2025 07 13 04:00     -1.00000  104.56651  -14.56651  315.94881
2025 07 13 05:00     -1.00000  111.61138  -21.61138  328.59405
2025 07 13 06:00     -1.00000  116.34490  -26.34490  342.93654
2025 07 13 07:00     -1.00000  118.21331  -28.21331  358.47147
2025 07 13 08:00     -1.00000  116.95435  -26.95435   14.12751
2025 07 13 09:00     -1.00000  112.74780  -22.74780   28.76822

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