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Sunrise and Sunset Applet
Finding the latitude by a watch

sunrise sunset
Select "Rise" or "Set" from the Details menu.


Click the applet area first. Then:
enter decimal degree values for latitude (southern negative) into the text field of the applet,
enter decimal degree values for longitude (western negative) into the text field,
then 
press the button Apply input.

input

Latitude 51.51, Longitude 13.41 is Berlin/Germany.
yKey

You may use the keys y, m, d, h to increase the year, minute, day, or hour,

or shift key and y, md, h to decrease the year, minute, day, or hour.

seconds
To increase or decrease the seconds use the butons or the keys s or shift key and s.
The time difference fon rise or set is indicated by
Δt=...
Select "Rise" or "Set" from the Details menu to reset to Δt=0 s.
details

Select from the "Details" menu to get a data table or diagrams.
Repeat "Zoom in" or "Zoom out".

The applet is computing and drawing sunrise and sunset. You can simulate the method decribed below.
Measuring the duration Δt of the Sun's diameter rising or setting the approximate latitude φ can be computed by the following formula (diameter D of the Sun in arc minutes
, Δt in seconds, declination δ)

latitude formula
Select "Time Table" from the Details menu:

rise set time table
                        diameter

Select "Time Table/Graph" from the Details menu (please be patient, the calculations will take about half a minute):

sunrise sunset
                                table


diagram sunrise sundet graph


 
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N. Liapin: A method of finding the approximate latitude by observing the Sun's diameter at rising or setting

© 2011-2013 J. Giesen

Last modified: 2013 Feb 04