Partial. a penumbral lunar eclipse is when the moon passes through the earths penumbra
Answer:
Thus, 
Explanation:
The angular speed is defined as the rate of change of angular velocity.
Its SI unit is rad/s and other units are rev/min or rev/s.

Yes because it helps them locate their position and direction
Answer:
no ... hahahha! but I know every boys wait for the day when their heart beat is faster than normal ever in life