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Solar Position and Intensity (SOLPOS)
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Solar Resource Data and Tools
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Solar Position and Intensity
» SOLPOS Calculator
SOLPOS Calculator
Compute the solar position and intensity from time
and location using NREL's
SOLPOS
.
Required input values:
Enter start date:
Year:
Month:
January
February
March
April
May
June
July
August
September
October
November
December
Day:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
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28
29
30
31
Enter end date:
Year:
Month:
January
February
March
April
May
June
July
August
September
October
November
December
Day:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Enter output time interval:
Interval:
1
2
5
10
15
30
60
Units:
Second
Minute
Enter site location information:
Latitude, degrees north (south negative)
Longitude, degrees east (west negative)
Time zone, east (west negative)
Surface pressure (mbar)
Ambient dry-bulb temperature (
o
C)
Optional input values:
Azimuth of panel surface
Degrees tilt from horizontal of panel
Solar constant (W/m
2
)
Shadow-band width (cm)
Shadow-band radius (cm)
Shadow-band sky factor
Interval of a measurement period (sec)
Check desired output values:
Relative optical airmass
Pressure-corrected airmass
Solar zenith angle, degrees from zenith, refracted
Solar azimuth angle
Cosine of solar incidence angle on panel
Cosine refraction corrected solar zenith angle
Solar elevation (no atmospheric correction)
Solar elevation angle (degrees from horizon, refracted)
Extraterrestrial Global Horizontal Solar Irradiance (W/m
2
)
Extraterrestrial Direct Normal Solar Irradiance (W/m
2
)
Extraterrestrial Global Irradiance on a tilted surface (W/m
2
)
Sunrise time, minutes from midnight (local w/o refraction)
Sunset time, minutes from midnight (local w/o refraction)
Shadow-band correction factor
Factor that normalizes Kt, Kn, etc. (prime)
Factor that normalizes Kt', Kn', etc. (unprime)
Check additional desired output values:
Day angle (degrees)
Hour angle (hour of sun from solar noon, degrees west)
Solar zenith angle, no atmospheric correction
Declination (zenith angle of solar noon at equator, deg. north)
Ecliptic longitude (degrees)
Obliquity of ecliptic
Time of ecliptic calculations
Equation of time (minutes)
Earth radius vector (ratio)
Mean anomaly (degrees)
Mean longitude (degrees)
Right ascension (degrees)
Sunset hour angle (degrees)
True solar time, minutes from midnight
True solar time minus local standard time
Greenwich mean sidereal time (hours)
Universal (Greenwich) standard time
Local mean sidereal time (degrees)
Julian Day of 1 Jan 2000 minus 2,400,000 days
Please read the
disclaimer
before using this product.
For more information about
SOLPOS and the C source code
.
For questions about this website or the calculator contact:
Afshin Andreas