As the sky rotates totally in 24 hours, the correct time is essential. When you start Pocket Universe, the program will use the current system time. Make sure this is correct, including the date. You can enter any date and time you wish, from the Set Time and Date dialog. The Daylight Saving Time is important.
Many countries advance the time by one hour during summer.
Check this box if DST is currently in force. At any point, you can force the system to use the current time by either opening this dialog and clicking on the Set to current time button, or by using the menu option Current Time from the tools menu.