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GeoAstro Applets

Astronomy

Chaos Game

Java

Miscel- laneous

  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"     Check the time zone to get the correct local times. To get this data window select "Day" from the write menu: To get this window select "Draw year" from the "Write/Draw" menu: You can use the key "d" to increase the date or shift key+"d" to decrease the date, and the key "m" to increase the month or shift key+"m" to decrease the month. 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: 2023, Oct 04