Before using the program, you should set your geographical coordinates. It is used for computation of the azimuth, altitude of variable stars and the solar and lunar data.
Location - name of the observation site. Example: Brno, Czech Republic.
Longitude - longitude in decimal form. Use positive values for locations on the eastern hemisphere and negative values for the western hemisphere. Example: 16.6667.
Latitude - latitude in decimal form. Use positive values for locations on the northern hemisphere and negative values for the southern hemisphere. Example: 49.2167.
Time zone - standard time zone. This values is used to compute the beginning and end of an observation night; it starts and ends at local noon. The default value is 'Read from system', which means that the program will read the standard time zone from the operating system. Please note, that displayed times of minima, rise times and set times of celestial objects are presented always in UTC, regardless of the time zone selected.
If you make ephemerides for more locations, you can save the geographical position for each place into the table of predefined locations and then recall the settings in the configuration dialog.
In the configuration dialog, click on the button with ellipsis (...). The new dialog window appears.
In the dialog window, enter designation of the location, its geographical latitude and longitude and standard time zone.
Click on the Add button to save the values to the table.
Use the Replace and Delete buttons to edit content of the table.
Click on the Save button to save changes and close the dialog.
The default settings of twilight is the nautical twilight, which ends and starts when the solar elevation angle is 12 degrees below the horizon. It is possible to change this value in a special configuration dialog. This dialog is accessible from the Setup dialog by the Advanced settings button.