Answer:
It takes about 2 minutes for the sun to completely disappear below the horizon.
Explanation:
Earth's rotation in a day= 360 degrees
Sun's Diameter= 0.5 degrees
360/24hr= Earth's rotation is 15 degrees/hour
If the sun's diameter is 0.5 degrees it takes:
15/0.5=30
60/30= 2 minutes (since there are 60 minutes in an hour)