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One day on the moon is equal to a month on earth. This is because one of the moon's orbits around earth is the same as one rotation of the moon on its axis. So when we see the phases of the moon change, we are actually seeing a day slowly unfolding and coming to an end on the moon's surface. This explanation would have to be modified if the moon turned more rapidly on its axis, but that wouldn't change the moon's phases as we see them. Another explanation for the phases of the moon is to think of the angle that is formed by these three points: sun, earth and moon. We would call this the sun-object angle of the moon. Earth is always the point at which the angle is measured. During a total solar eclipse, the moon is totally dark and the angle is zero, and during a total lunar eclipse the moon is at full phase and the angle is 180 degrees. As the moon orbits the earth over the course of a month, this angle changes, and it describes the amount of the moon's surface that will appear illuminated to us on earth.

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Related Questions

Why does the moon seem to change shape from week to week?

well, the moon and sun block it


What shape is the moon this week?

the moon is always spherical, it's just the way the clouds are and how you look at it.


Does the moon change its own shape?

It doesn't. The molten core of the moon has long since cooled off and solidified. The moon appears to change its shape depending where it is relative to the sun and the earth. For example, a new moon (completely dark) occurs when the sun is shining on the other side of the moon. The crescent moon appears one week later as the moon travels round the earth and we see a little bit of the illuminated side.


What shape was the moon last week?

no idea help me please i need to type this for homework and i cant remember what the shape of the moon was. i know yesterday there was a half moon but before that i didn't have time to look. can someone answer my question please or I'm gonna get into big trouble.


What shape is the moon half a week before new moon?

it's called a waning gibbous: it's a medium-sized crescent.


What did the moon look like this week?

It mostly looked like a full moon most of the week. Now it is waning away.


What is the difference between waxing gibbous and waxing cressent?

'Waxing' means 'growing bigger as time goes on'. 'Crescent' is the less-than-half-full shape of the moon, during the first week after a New Moon. 'Gibbous' is the more-than-half-full shape, during the second week after a New Moon.


Why does the position of the ocean ellipse change over the course of a given week?

The position of the ocean ellipse changes over the course of a week due to the gravitational forces of the sun and moon, which cause tides to shift. These forces create a cyclical pattern of high and low tides that vary throughout the week. Additionally, factors such as seasonal changes, wind patterns, and underwater geography can also influence the position of the ocean ellipse.


How long does it take Earth's moon to change its phases?

The moon goes through its complete cycle of phases ... taking every possible shape that it ever has ... in 29.53 days. The period of time from each of the following to the next one is roughly 1 week: New Moon First Quarter Full Moon Last Quarter New Moon


Why does the moon look different from week to week?

The changing appearance of the moon from week to week is due to its different phases as it orbits the Earth. As the relative positions of the Earth, moon, and sun change, we see different portions of the moon lit by the sun. This creates the cycle of moon phases, such as new moon, first quarter, full moon, and last quarter.


How long does it take the moon to change from new moon to a first quarter?

im guessing one week please correct me if im wrong


What happens to the shape of the moon from new moon day to full moon day and vice-versa?

The moon shape waxes (gets bigger) from New Moon (no moon visible) to a thin waxing crescent, to the First Quarter (about a week later - half lit) to Full Moon ( about week after that) and it wanes (shrinks back) to the Last quarter and then to a waning crescent, to New Moon again. This cycle repeats itself every month or 29.5 days, more specifically.