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They align twice with the Earth.

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15y ago

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Why do you see a full moon?

A full moon happens when the earth is between the sun and the moon, around the time in the month when the three bodies come as close to a straight line as they can get. The plane that contains the earth's orbit is not the same plane that contains the moon's orbit. So the sun, earth and moon cannot form a straight line every month during the full moon. If there were a straight line formed every month, then there would be an eclipse of the moon during every full moon. When a full moon happens at one of the two 'nodes', where the moon's orbit passes through the earth's orbital plane, there will also be an eclipse of the moon that month. So, strange as it may seem, there are slight variations on the actual 'fullness' of full moons from month to month.


Though the moon comes once between sun and earth every month how come there is no solar eclipse every month?

The plane of the Moon's orbit is tilted to the ecliptic, which is the plane of the Earth's orbit. So 5 times out of six, the Moon is either above or below the direct line from the Earth to the Sun, and no eclipse happens.


Who revolves once every month the sun or moon?

My period. -_-


When does a full moon come out?

A full moon occurs about once every month when the moon is on the opposite side of the Earth from the sun, causing its face to be fully illuminated. This typically happens around the middle of the lunar cycle.


Why do you see the full moon only once a month?

The moon takes one month to complete a revolution around the earth. A full moon occurs when the moon is on the opposite side of the earth from the sun (opposition). The full moon can only happen at this part of the lunar orbit, and it takes one month to complete the orbit; thus, full moon happens once a month.


Why is it possible for the moon to seem to disappear from the sky every month?

That happens when the moon is out 'in front' of us, slightly closer to the sun than we are. When things are in that position and we look at the moon, we're looking at the 'back' of it ... the part that the sun isn't shining on ... so we see nothing.


Why don't we experance an eclipse every month?

We don't experience an eclipse every month because the Moon's orbit is tilted about 5 degrees relative to Earth's orbit around the Sun. This tilt means that the Sun, Earth, and Moon do not always align perfectly during the new moon (for solar eclipses) or full moon (for lunar eclipses). Eclipses only occur when the Sun, Earth, and Moon are in a straight line, which happens only a few times a year at specific points in their orbits called nodes. Therefore, while we have new and full moons every month, eclipses are much less frequent.


How often does a new moon occur?

The full moon occurs whenever the moon orbits the earth opposite the sun. It takes the moon roughly 28 days to orbit the earth, so once every two weeks it is opposite the sun from us (full moon), and two weeks later it is on the same side as the sun and all we see is the moon's "night" side (new moon).


What is a full moon and why does it occur?

A full moon occurs when the Earth facing side of the moon is fully illuminated by the sun. Why? Because every month the Earth lies between the moon and the sun.


When do you see full moon?

On average a full moon occurs every 29.53 days but it can be 29 days or 30 days hence the average.


When do we get full moons?

Full moons occur approximately every 29.5 days, when the Moon is directly opposite the Sun in the sky, appearing as a complete circle. This happens because of the Moon's orbit around Earth.


What case a eclipse?

A solar eclipse is when the moon, momentarily blocks out the sun. It happens around once a month