# The angular size of your finger at arm’s length is about...

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Rowan Introduction to Astronomy Activity #2: Angular Measure, Moon, & Eclipses Name: _______________________________________________ Score: ________________________________ 1. 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?] [5 pts] Show your work (use dimensional analysis): [10 pts total] [Work = 5 pts] 2. 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? ______________________° [5 pts] Show your work (use dimensional analysis): [10 pts total] [Work = 5 pts] 3. (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]