Unformatted text preview: to go from one major phase to the next - by major phase I mean New, the Quarters and Full. If the Moon is New today, it will be a First Quarter Moon in about one week, and a full Moon two weeks from today. The fact that it takes about 29.5 days to go through the cycle is the reason there are about 30 days in a month, since many ancient societies used the Moon as a time keeper. Figure 7. The phases of the Moon as seen from Iowa when the Moon is high in the sky (on your meridian). What causes the phases? To figure that out, you need to look at the interaction of the light source (Sun) and the alignment of the Moon with the Earth. The Moon will have a certain phase depending upon two things -1. The location of the Moon in its orbit about the Earth 2. The location of the Sun relative to the Earth and the Moon at that time Don't forget about these two things....
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- Fall '10
- Astronomy, Waning Crescent, Waning Gibbous