This screen allows you to enter your latitude and longitude and the name of your location. Many locations can be entered and stored to let you switch between the specifics of different observing locations. The Timezone and Daylight Savings Time setting are stored along with the location information.

A common mistake is to set the timezone to GMT+??:?? (where ??:?? is the timezone offset) instead of GMT-??:??

The first time you run LunarPhase Pro, you will need to update the "Home" location so LunarPhase Pro knows what latitude and longitude to base its calculations upon.

Four buttons allow you to add/edit/delete locations.
Add adds whatever data is on screen as a new location, Update updates the existing location with the data onscreen, overwriting the previous data for that location. Delete permanently removes a location. Cancel resets everything to blanks and zeros.

You can change locations simply by selecting a different location from the dropdown list. The contents of this list are automatically updated whenever a new location is added or an existing location is deleted.

The screen also allows you to change the day order on the calendar and the date format for the Ephemeris screen.

The Daylight Savings Time (DST) tickbox should be ticked if you are currently in DST. DST is not automatically set by LunarPhase Pro as you may want to look at lunar information for dates that are not within the DST period (or vice versa).

The "Use OpenGL" option lets you specify if LunarPhase Pro will use the OpenGL graphic features (to display a spherical projection map on the Lunar Explorer screen, for example) or not, in which case, only a mercator projection map will be available on the Lunar Explorer screen. To get the most out of LunarPhase Pro, this option should be ticked.

The Earthshine option is only applicable if the "Use OpenGL" option has been ticked. It determines if black shadows are used on the main lunar phase display or if low-level illumination is used so you can see the features that are currently in shadow on the moon.

You can also set which lunar feature type will automatically appear when you access either the Features Rise/Set Times screen or the Features Database screen.