The selected date is displayed at the top of the screen, along with additional controls to change the date. The sun and moon data displayed on the map below is always calculated for the selected date, so it's important to ensure this is set correctly.
You can control the selected date using dedicated buttons as follows:
|Set date/time to that of the previous celestial event before the current selected date
|Move back one day
|Move forward one day
|Set date/time to that of the next celestial event after the current selected date
Note: previous/next event buttons are not shown on devices with 3.5 or 4 inch screens (e.g. iPhone 4/4S, iPhone 5). You can select events from the list displayed by tapping the selected date.
Tap the date displayed at the center of the navigation bar to select a particular date. A date picker control and list of celestial events is displayed.
Taping the clock face icon in the upper left corner, turns on live tracking and jumps to the current date and time. Note, that the time is set to that of your device's internal clock, irrespective of the time zone for the current location shown on the map. Tap again to turn off live tracking.
The app can be used in two distinct modes, day mode and night mode. To view the current mode, tap the date at the top of the screen and it will be display on the Dates and Events screen:
|The app shows sun and moon data for period from midnight-to-midnight for the selected date. Use this mode for daylight photography, including sunrise, sunset, and twilight.
|The app shows moon, milky way, and star data for the period midday-to-midday, starting at midday on the selected date. Use this mode for night photography.
Select either day or night mode using the options shown.
See here for a guide to the information that is displayed when Night Mode is enabled.