The Moon Formation - Impact from Mars-size object ejects material into orbit… forms Moon. - Best model to explain Moon’s composition.

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Presentation transcript:

The Moon Formation - Impact from Mars-size object ejects material into orbit… forms Moon. - Best model to explain Moon’s composition.

Lunar Phases Half of the Moon is always illuminated by the Sun. But, we see moon phases? Why? -- Because of moon’s revolution and angle.

Lunar Phases Moon revolves (and rotates) around Earth in 27.3 days. -- Because of this, we only see one side of moon. (synchronous orbit).

But, A full phase cycle = 29.5 days. ie. Full moon to full moon. Why the 2 day difference? Because the Earth has moved in the meantime

Moon Phases Terms: Waxing = moon is in first half of cycle. Waning = moon is in last half of cycle. Gibbous = “hunchback” = moon close to full.

Eclipses Lunar Eclipse = when Earth’s shadow covers the moon. Only during full moon phase. Umbra (shadow) covers moon completely. All persons on dark side of Earth can see the eclipse. Usually 2 to 5x per year.

Solar Eclipse Solar Eclipse = When the moon covers the sun. Only during a New Moon. Umbra (shadow) is small. Covers only a small portion of Earth. Usually 2 to 5x per year.

Moon’s Orbit The Moon’s orbit is tilted 5 o. Important! Otherwise, there would be a solar and lunar eclipse every month.

Moon’s Orbit

Tides Tides = cyclic rise and fall of ocean levels. Caused primarily by Moon’s gravity.. not sun’s. Spring Tide = Moon and Sun align. Neap Tide = Moon and Sun not aligned.

Neap vs. Spring Tides Spring Tides: - highest high tide and lowest low tide. - Happens at full and new moon phases.

Neap vs. Spring Tides Neap Tides: - High tide not so high and low tide not so low. - Happens at quarter moon phases.