Why moon appears on day?

Answer 1

As answered by Jfmirage and Aryaman2000

The Earth rotates around it's own axis every 24 hours.

The side of the Earth which faces the Sun is considered day.

The moon roughly revolves around the Earth every 28 days.

The moon does not produce any light itself.

When you see the moon you are seeing light which is reflected

off the moon's surface.

The amount of light reflected depends on the angle the moon

makes between the Earth and the Sun.

These cause the phases of the moon.

For example, when the Earth is between the moon and the Sun,

a full moon is seen only at night. Because the side of the moon

which reflects the sunlight is facing the part of the Earth that is

facing away from the Sun. You can only see a full moon at night.

When the moon is between the Earth and the Sun, the side of

the moon which is reflecting the sunlight is pointed away from

the Earth, so you can't see the light. This is a new moon.

Between these two extremes are the other phases,

crescents, quarters, gibbons. Each representing more and more

of the surface of the moon which is reflecting the sunlight.

During these phases, portions of the Earth can see the reflected

sunlight off the moon while that portion also faces the sun.

Hence you see the moon during the day.

If you see the moon rising after the sunrise the moon is going

from new moon to full moon. Each morning you will see more

and more of the moon, and the moon will rise later and later.

Until the moon only rises after the sunsets, which would be a full moon.

Similarly, if the moon is east of the sun, the moon is going from new moon to full moon.

If you see the moon setting before the sunset, the moon is going from full moon to a new moon. Each evening you will see less and less of the moon until the moon disappears which would be a new moon.

Similarly, if the moon is west of the sun the moon is going from full moon to new moon.