If a phone knows where north is, it can also know where the sun is
Why not make a fun clock?
Sun clock is on of the oldest types of clocks
Problems
The phone can't know where the sun is without knowing the time
it is complicated to calculate more accurate sun position based on latitude
GPS works better outdoors for obvious reasons
Sun Clock
FEATURES
Shows a cool sun clock (baesd on the old sun clock located in Sevastopol)
Turns the clock to face the right direction as it would be faced as a real sun clock, if you turn the phone the clock turns to still be facing in the right direction