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Präzisionssonnenuhr     precision sundial     cadran solaire de précision

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Präzisions Sonnenuhr Sonnenuhren sundial sundials cadrans solaires zonnewijzers meridiana relojes de sol

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Calculation

 

The following effects are taken

into account in the calculation:

 

-  the elliptical orbit of the earth

-  the inclination of the rotation axis

   of the earth to the ecliptic

-  the precession of the earth axis

-  the earth as a ellipsoid

-  the diffraction of the light rays

   in the atmosphere

-  calculation of the deepest shadow

   of the hand on the dial depending

   on the distance    

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ecliptic

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sun

earth

aphelion

perihelion

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