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Shows position of the sun at any given point in time
Shows position of the moon at any given point in time
Position of sunrise and sunset for current day
Position of moon rise and moon set for current day
Position of the latest and earliest sunrise
Position of the latest and earliest sunset
Maps of type "map", "satellite", "hybrid" and "terrain"
Compass to help determine where sun will be at any given date and time
Save locations on map with notes
Displays moon phase and illumination
Change date/time with either a slider, or precise buttons.
Shows a camera's field of view indicator in landscape and portrait modes
Shows position of starts, constellations and Messier objects

To access all of the settings options note that the settings can scroll both up and down and side to side.

To use the compass, click the navigator icon on the right, and the heading indicator will turn on. Line up the heading indicator line with any of the sun line, sunrise or sunset lines, and the direction the phone is facing is the direction the sun will be. The compasses in phones are pretty inaccurate, you can usually increase the accuracy by moving the phone around in a figure-eight pattern. You can also gauge the accuracy by pointing the phone towards the sun and observing how far off it is.

Permissions: This app doesn't require any extra permissions than what is absolutely necessary to function. It uses the Google Maps API which requires access to external storage and network access. Additionally it requires access to location data to show your current position. I do not track or collect any information about users of this app, but I cannot speak for any tracking or collection the Google Maps API does.