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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 a location from the menu list, or enter the coordinates (decimal degrees)
for latitude (northern positive, southern negative), and longitude (eastern positive, western negative),

and hit the button "Apply input"

input   

Check the time zone to get the correct local times.

To get this data window select "Day" from the write menu:

data

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):

formula

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)

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


Last Modified: 2013, Feb 04