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Solar Ephemeris Calculation Utility
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Click on the map to change geographic latitude and longitude, then press "calculate".
For calculation of the Solar Ephemeris enter a date in the given
format and press the Calculate button!
Note: Values valid from the year -2000 to 6000, with an uncertainty
of +/- 0.0003 degrees. Source code: SPA calculator from US Department
of Energy, (Reference: Reda, I.; Andreas, A., Solar Position Algorithm
for Solar Radiation Applications, Solar Energy. Vol. 76(5), 2004; pp. 577-589)
API access
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http://cesar.kso.ac.at/info/ephem_api.php?date=20220607&time=13:26:55&lat=46.6783&lon=13.9067
- returns all values for the location of the Observatory at 13:26:56 on June 7 2022
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http://cesar.kso.ac.at/info/ephem_api.php?date=20220607&time=13:26:55&lat=46.6783&lon=13.9067&JD
- returns only the Julian Date for the location of the Observatory at 13:26:56 on June 7 2022
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http://cesar.kso.ac.at/info/ephem_api.php?date=20220607&time=13:26:55&lat=46.6783&lon=13.9067&JD&Decl
- returns the Julian Date and the declination for the location of the Observatory at 13:26:56 on June 7 2022
- the parameters are:
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| date | Date[yyyymmdd] | time | Time[HH:MM:SS] |
lat | geogr. Latitude[deg] | lon | geogr. Longitude[deg] |
| JD | Julian Date |
RA | Right Ascension[deg] | Decl | Declination[deg] |
ET | Equation of Time |
| Dist | Distance[AU] | Dia | Diameter{arcsec] |
H | Height[deg] | Az | Azimuth[deg] |
| Rise | Sunrise[UTC] | Set | Sunset[UTC] |
Noon | Noon[UTC] | NoonH | Height at Noon |
| P | Polar Angle[deg] | B0 | Inclination[deg] |
Lon | Heliogr. Longitude[deg] | Carr | Carrington Rotation |
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if date is ommitted the actual day will be used
if time is ommitted the actual time (UTC) will be used
default for lat and lon is the KSO position
calling the API without parameters will return the valus of the actual time for KSO
Input Values
- Day
- Day for calculation in the format yyyymmdd.
- Time
- Time in UTC in the format hh:mm:ss. The calculations are done in UTC - no correction for time zones!
- Latitude
- Latitude of the observer in degrees, North is positive.
- Longitude
- Longitude of the observer in degrees, East is positive.
Output Values
- Julian Date
- Consecutively numbered days since Jan 01, 4713 B.C.
(days start at noon 12 UTC!)
- R. A.
- Right Ascension of the Sun.
- Decl.
- Declination of the Sun.
- Dist.
- Distance of the Sun, measured in astronomical units (A. U.)
- App. Diam.
- Apparent diameter of the Solar disk, measured in arc seconds.
- P
- Position angle of the northern extremity of the axis of Solar
rotation, measured eastwards from the North point of the Solar disk.
- Bo
- Heliographic latitude of the central point of the Solar disk.
Angle of inclination of the Solar equator on the Ecliptic
(counted positive if Solar North Pole is visible).
- Lo
- Heliographic longitude of the central point of the Solar disk,
measured towards West (i. e. in direction of Solar rotation) from
the hypothetical prime meridian which rotates with a mean synodical
(Carrington) period of 27.2753 days.
- Carr #
- Number of Solar rotations since Nov. 9, 1853
- Azim.
- Azimuth of the Sun at observers position,
measured from North eastwards.
- Height
- Height of the Sun above Horizon at observers position.
Not corrected for refraction!
- Sunrise, Sunset
- Sunrise and Sunset at observers position
in Universal Time Coordinated (UTC). Sunrise and Sunset are defined as times where
the upper limb of the Solar disk appears to be at the horizon,
correction for refraction (≅0.83 deg) under normal conditions is
considered.
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