PHASES OF THE MOON.

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Presentation transcript:

PHASES OF THE MOON

Why does the moon’s shape change? It does not change. We just can’t see all of the lighted-up part all the time.

Watch the animation – make sure you see why the moon appears to change its shape. http://www.valdosta.edu/~cbarnbau/astro_demos/frameset_moon.html

Names of the phases WAXING = GETTING BIGGER WANING = GETTING SMALLER

The moon as a clock When the FULL MOON is rising, about what time is it? a. sunrise b. noon c. sunset d. midnight (Think of the sun-earth-moon angle when the moon is full – 180o )

The moon as a clock When the FULL MOON is rising, about what time is it? a. sunrise b. noon c. sunset d. midnight

The moon as a clock When the QUARTER MOON is rising, about what time is it? a. sunrise b. noon c. sunset d. midnight (Think of the sun-earth-moon angle when the moon is a quarter phase – 90o )

The moon as a clock When the QUARTER MOON is rising, about what time is it? b. noon or d. midnight (depending on which quarter – first or last)

It takes 29.5 days for the moon to go through one complete cycle (about 1 month).

Why can we sometimes see the NON-LIGHTED part of the moon during the crescent phase??

EARTHSHINE Why can we sometimes see the NON-LIGHTED part of the moon during the crescent phase?? EARTHSHINE Reflected light From EARTH