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 10 15 10:00     -1.00000  126.68297  -36.68297   67.54916
2026 10 15 11:00     -1.00000  115.68881  -25.68881   79.23111
2026 10 15 12:00     -1.00000  104.27647  -14.27647   89.33659
2026 10 15 13:00     -1.00000   92.83690   -2.83690   98.89989
2026 10 15 14:00      6.55537   81.69791    8.30209  108.71842
2026 10 15 15:00      3.07481   71.22656   18.77344  119.53896
2026 10 15 16:00      2.11539   61.91990   28.08010  132.14775
2026 10 15 17:00      1.71727   54.48822   35.51178  147.28114
2026 10 15 18:00      1.54797   49.84907   40.15093  165.15431
2026 10 15 19:00      1.51676   48.84191   41.15809  184.69538
2026 10 15 20:00      1.60965   51.68676   38.31324  203.65984
2026 10 15 21:00      1.87079   57.80091   32.19909  220.24015
2026 10 15 22:00      2.46729   66.24815   23.75185  234.06702
2026 10 15 23:00      4.10832   76.19845   13.80155  245.69670
2026 10 16 00:00     14.54019   87.05378    2.94622  255.91835
2026 10 16 01:00     -1.00000   98.39279   -8.39279  265.49379
2026 10 16 02:00     -1.00000  109.88112  -19.88112  275.17409
2026 10 16 03:00     -1.00000  121.17908  -31.17908  285.83994
2026 10 16 04:00     -1.00000  131.82035  -41.82035  298.73442
2026 10 16 05:00     -1.00000  141.00209  -51.00209  315.72115
2026 10 16 06:00     -1.00000  147.27989  -57.27989  338.82135
2026 10 16 07:00     -1.00000  148.74827  -58.74827    6.87094
2026 10 16 08:00     -1.00000  144.78409  -54.78409   33.12935
2026 10 16 09:00     -1.00000  136.90207  -46.90207   53.15193
2026 10 16 10:00     -1.00000  126.90107  -36.90107   67.92595

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