The APT Settings dialog box is accessible from Tools tab or with Alt+S shortcut.
The Location settings tab contains the options related to your site coordinates and possibilities to synchronize them. It is important to define the coordinates because they are used by Darkness Clock, Deep Sky Darkness Calculator, the filter of visible objects in Objects Browser and checking if object is above horizon on GoTo.
Defines an offset from the calculated Astro Twilight. This allow to define that astro night starts X minutes earlier and ends X minutes later. By this way the automated imaging cans start earlier and end later. This offset is used by the #ConditionalStop script command, by SessionCraft and by manually scheduled plans via Start options.
The current site coordinates will be used to set the coordinates of the telescope as soon as it is connected.
Note: If you want to export location information to EQMOD/EQASCOM you have to enable the option "Allow Site writes". To open the EQMOD settings panel use either: