There are several reasons the moon may not be visible:
1) It is over the horizon from the person observing it - past their line of sight
2) The view of the moon is blocked by something such as clouds (or walls if you are inside)
3) During a "new moon" the side of the moon that is illuminated is opposite the side that would be observed from the surface of the earth - and it is rising and setting with the sun. The moon may still receive a small amount of light reflected from the earth, but under these conditions, the moon is not visible because without that illumination from the sun, the sun is so much brighter than the feeble re-reflected light (from the sun to the earth to the moon) that the moon is not visible. A dramatic example of this is when the moon lines up with the sun to produce a solar eclipse.
because the sun is shinning on the moon which makes the moon visible
The Dark Moon, sometimes call "New Moon" is the phase of the moon where it is between the Earth and the Sun and cannot be seen.
The Dark Moon, sometimes call "New Moon" is the phase of the moon where it is between the Earth and the Sun and cannot be seen.
Sometimes, yes. Whether or not the moon is visible depends on the time of year, time of day or night, and the position of the moon.
because sometimes the moon is in the wrong position to reflect the sun's light. The sun's light is what makes the moon "light up".
because the sun is shinning on the moon which makes the moon visible
Sometimes. When the Moon is just setting in America, it is rising in Asia.
Sometimes when it is in the morning.
The Dark Moon, sometimes call "New Moon" is the phase of the moon where it is between the Earth and the Sun and cannot be seen.
The Dark Moon, sometimes call "New Moon" is the phase of the moon where it is between the Earth and the Sun and cannot be seen.
Sometimes, yes. Whether or not the moon is visible depends on the time of year, time of day or night, and the position of the moon.
because sometimes the moon is in the wrong position to reflect the sun's light. The sun's light is what makes the moon "light up".
The moon orbits the earth once a month, so throughout the month, observations taken at the same time of day will show how the moon moves around us during that time. Sometimes it will be in the west, sometimes above and sometimes in the east. A lot of the time it won't be visible on your side of the planet. It depends on where the moon is in it's orbit.
Because of the sun light reflecting off of it. Update: Normally new moons are invisible since the moon is between the Earth and Sun. However during the rare solar eclipses the new moon will be visible as a silhouette.
Yes, the Earth is visible from the moon
The new moon is visible once a month when the moon is blocked by the Earth's shadow
There are 8 "named" phases of the Moon, representing the portion of its sunlit surface that is visible from Earth. (Whether the progression is from right to left, or left to right, depends on whether you are north or south of the Equator) New moon (Not visible or very barely visible) Waxing Crescent moon (1-49% visible) First Quarter moon (50% visible) Waxing gibbous moon (51-99% visible) Full Moon (Fully visible) Waning gibbous Moon (51-99% visible, opposite side of face from Waxing) Last Quarter Moon (50% visible, opposite half from that visible on First Quarter) Waning Crescent Moon (1-49% visible)