An Assessment Best procedures: read quietly to yourself (so you don’t give any subconscious clues) As the instructor, we read it too, for timing, then ask if anyone needs more time If not, it’s time to vote simultaneously—use your fingers, right in front of your chest so others don’t see (anonymous) In which case(s) can the Earth, Sun, and Moon be in a straight line, as seen from above the solar system? full Moon only first quarter and third (or last) quarter new Moon only both full and new Moon This can happen at any phase of the Moon.

Percentage illuminated Examine the data for the percentage of the Moon’s near side illuminated for the following dates. What lunar phase will occur on Feb 13? waning crescent full at or very near first quarter at or very near new any of the above, depending upon other factors. Date Percentage illuminated Feb 1 24% Feb 2 15% Feb 3 8% Feb 4 3% Feb 5 0% Feb 6 1% Feb 7 5%

Which motions cause the Moon’s phases? Earth’s rotation on its axis. Earth’s orbit around the Sun. The Moon’s rotation on its axis. The Moon’s orbit around the Earth. a and c a, b, and d b and d c and d d