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Physics Quiz

Night Hours Applet

The night is the astronomer's day.

 Enter the coordinates (decimal degrees) for the latitude, and longitude. Then press "Apply input":

  

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.


© 2003-2023 Juergen Giesen

Updated: 2023, Oct 04