To compute times of sunrise and sunset a geographic position is required. The position tab in the preferences dialog is meant for this purpose as seen below.
the position tab inside the preferences dialog
With the position tab the user can set and select geographic positions. A geographic position is required to compute times of sunrise and sunset.
Initially the list of positions to select from inside the preferences dialog is empty. To create a new position button Add can be used. This way each user can define an own individual set of positions.
A positive value for latitude equals north, a negative one equals south. A positive value for longitude equals west, a negative one equals east. Similarly a positive value for time zone means later than universal time (UT), a negative value means earlier than UT.
Please note: Latitude and longitude are entered as decimal values. A value in degrees, minutes and seconds is converted to a decimal value using
decimal value = degrees + (minutes/60) + (seconds/3600)
Position data entered as described above is saved in the [user.home] directory in file positions.pos in subdirectory .geopos. Storage and retrieval is done automatically in the background.
See also