Zone is its time zone based solely on its longitude, not on civil boundaries. Lat is its latitude. Rise is its sunrise time. Set is its sunset time. For latitudes near the poles, it is possible that the Sun does not rise or set.
Longitude is tapped location's longitude.
Savings Time button. Pressing this button switches any tapped location from standard to daylight time, or vise versa, for all locations. See discussion on freezing time zones . In the 2X mode use the pen to drag the map. Date Selector allows selection of a different date.