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Night Hours

The night is the astronomer's day

Enter the coordinates (decimal degrees) for the latitude, and press RETURN, and for the longitude, and press RETURN:     Southern latitudes and western longitudes with a minus sign. Check the time zone to get the correct local times. The last column is the duration of night hours (sun below horizon): astronomical night hours:     from the end of astron. twilight to the beginning of astron. twilight next day,     The Sun is 18° below the horizon. nautical night hours:     from the end of nautical twilight to the beginning of nautical twilight next day,     The Sun is 12° below the horizon. civil night hours:     from the end of civil twilight to the beginning of civil twilight next day,     The Sun is 6° below the horizon. sunset to sunrise:     from sunset to sunrise next day,     The Sun is 0.83° below the horizon. The online version is also writing the results to a data window:   Compare to my Daylight Applet   Enter southern latitudes and western longitudes with a minus sign. <APPLET CODE="night095.class" WIDTH=350 HEIGHT=530 ALIGN=bottom archive="JavaClasses.jar"> <PARAM NAME=password VALUE=0> <PARAM NAME=email VALUE=replace> <PARAM NAME=location VALUE=Berlin> <PARAM NAME=longitude VALUE="13.41"> <PARAM NAME=latitude VALUE="52.51"> <PARAM NAME=timezone VALUE=1> </APPLET> For a place within the timezone of your computer clock you may set <PARAM NAME=timezone VALUE="auto"> to switch between standard time and daylight saving time automatically. In this case an astric (*) in the blue date line is indicating that daylight saving time is valid. © 2003-2007 Juergen Giesen Updated: 2007, Dec 11