The revolution of the Moon around the Earth makes the Moon appear as if it is changing shape in the sky. From Earth we see the Moon grow from a thin crescent to a full disk (or full moon) and then shrink back to a thin crescent again before vanishing for a few days. The changing shape of the bright part of the Moon that we see is called its phase.The moon is illuminated because it reflects the light from the sun. The part of the moon facing the sun is lit up. The part facing away from the sun is in darkness.
The phases of the Moon depend on its position in relation to the sun and Earth. As the Moon makes its way around the Earth, we see the bright parts of the Moon's surface at different angles. These are called "phases" of the Moon.The phases of the moon work in a cycle starting with the new moon. The new moon is seen when the moon and the sun are on the same side of Earth.
The moon is between the sun and the Earth. We see the side which is not lit, so the moon is dark. We can’t see a New Moon because the lit side is facing directly away from the Earth.The New Moon rises at dawn and sets at sunset.The waxing crescent moon can be seen soon after sunset low in the West. Although it rises in the East a little after Sunrise, you can't see it because it is too close to the Sun during the day.
The best time to see a waxing crescent moon is on the second and third days after New Moon when the crescent is fatter and brighter, and further from the SunThe quarter is when the moon has completed one quarter of an orbit around the Earth from either the full or new moon. One quarter of the moon's surface is visible from Earth. Sometimes called half moon.You can tell when the moon is first quarter because the sun lit side is on the right side as shown on the right. (In Australia and other Southern Hemisphere countries it would look like the left side is lit).A First Quarter Moon rises in the East at noon and sets in the West around midnight. At sunset, you’ll find a First Quarter Moon high above the southern horizon.
Monday, December 22, 2008
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