Kanzelhöhe Observatory


Institute of Physics
Institute for Geophysics, Astrophysics und Meteorology

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Solar Ephemeris Calculation Utility

For calculation of the Solar Ephemeris enter a date in the given format and press the Calculate button! Note: for simple and fast calculations low precision formulae were used - do not expect higher precision than given!

Day	UT	Julian Date

Solar Position	R. A.	^°	Decl.	^°	Dist. (AU)		App. Diam.	^"
Phys. Ephem.	P	^°	B_o	^°	L_o	^°	Carr #

» Sun's Postion at your location...

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, in arc seconds.
P: Position angle of the northern extremity of the axis of Solar rotation, reckoned eastwards from the North point of the Solar disk.
B_o: 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).
L_o: 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

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