The New moon is sometimes called the "dark moon" because
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Answer:
The new moon is sometimes called "dark moon" because the new moon starts on the amavasya night (new moon day). On the amavasya day we cannot see the moon that is it is dark. Hence, new moon is called dark moon.
Answer:
The moon is visible on earth because the light from the sun falls on it, gets reflected from it and enters the eyes of the people who are watching it on earth. The moon appears crescent, half, full, not at all, etc, depending on its position with respect to the sun and the earth.
The light falling on any part of the moon gets reflected. However the light reflected only from some part of the moon reaches the earth. Only that part is visible to the people on the earth.
On the new moon day, the moon is on the same side of the earth as that of the sun with respect to earth. No light from the moon reaches the earth and it becomes invisible. Its apparent colour is black, i.e. same of that as that of the night sky.
Hence it is also called as dark moon.
Explanation: