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  Applet: Elevation and Azimuth of the Sun

Elevation and azimuth of the Moon

Elevation and azimuth of the Sun and the Moon

Applet: Azimuth, Latitude, Hour Angle, Declination

Select your location from the menu list, or enter the coordinates (decimal degrees) for the latitude, and press RETURN, and for the longitude, and press RETURN:     Check the time zone to get the correct local times. To get this data window select "Day" from the write menu: The true elevation angles of the Sun are not corrected for atmospheric refraction, which is bending the light while passing through the Earth's atmosphere. The refraction R is calculated by Saemundsson's formula (Meeus, Astronomical Algorithms): h is the true (airless) elevation in degrees, R is in minutes of arc. The apparent (measured) elevation is h+R. Applet: Atmospheric Refraction

How to compute the position of the Sun
(Basics of positional astronomy)

"Instrument Buch" of Petrus Apianus, 1533
from Bruno H. Bürgel: Aus fernen Welten, 1920

Last Modified: 2012, Jan 27