The Motion of the Moon The Moon The Earth, Sun, and Time of Day

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Astronomy 310 (Newbury) May 15, 2007 Waxing Gibbous Third Quarter sunlight some dark one side mostly lit sunlight one half dark one half lit After the Full moon, the sunlit portion of the Moon begins to get smaller (begins to “_______”). It’s still gibbous, so we see the waning gibbous Moon early in the _________. 13 Three quarters of the way through the cycle, about 3 weeks, we see the ________ half the Moon lit and the other half _______. This is the third quarter Moon. 14 Waning Crescent New Moon, Again After 29.5 days, the ______ starts over again… mostly dark a bit lit, too sunlight new Moon very young Moon Near the end of the lunar cycle, we see only a _______ (pointing towards the Sun). The crescent is getting smaller each day, giving a waning crescent Moon. We see it in the morning – just before ______ is best. 15 very end of cycle 16 4
Astronomy 310 (Newbury) May 15, 2007 sunlight See how easy it is now _____! Eclipses There is a lot of information _____ inside this diagram! 17 APOD 2006 April 4 APOD 2006 April 4 Recall the Full Moon… Eclipses sunlight Eclipses of the Sun and Moon are (the most) spectacular astronomical events. Solar eclipses, as we’ll see shortly, are difficult to see, so if you’ve ever seen a total solar eclipse, you are _____________. Recall that when the Moon on the side of the Earth __________ the Sun, we see a full Moon. An obvious question is, doesn’t the Earth ________ ________ The answer is yes, sometimes, but not every lunar cycle. Eclipses require special alignment. 19 solar eclipse (August 1999) APOD 2006 March 30 A solar eclipse occurs when the Earth passes into the ________ of the Moon. The Moon blocks the Sun, as seen from Earth. It happens only when the ______, Moon and Earth are aligned. 20 5
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The Motion of the Moon The Moon The Earth, Sun, and Time of Day

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