Rowan Introduction to Astronomy
Activity #2: Angular Measure, Moon, & Eclipses
The angular size of your finger at arm’s length
is about 1°. How many arcseconds is this? _____________________ arcsec
Write as a regular number. [Hint: How many arcseconds in an arcminute? How many arcminutes in a degree?]
Show your work (use dimensional analysis): [10 pts total] [Work = 5 pts]
As the Moon orbits the Earth, it moves about 13.2° per day. Over the course of a calendar week (Sunday through Saturday),
how many degrees will it have moved? ______________________°
Show your work (use dimensional analysis): [10 pts total]
[Work = 5 pts]
(a) At 8 a.m., the Moon is visible with half its face dark and the other half a ghostly white against the morning blue sky.
What phase is the Moon in?
[Part a = 5 pts]