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Question
At what phase are the earth, moon and sun are in approximate alignment?
At what phase are the earth, moon and sun are in approximate alignment?
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Solution
The correct options are
A Full Moon
B New Moon
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.On the full moon day, the moon is on the opposite side of the earth as that of the sun with respect to earth. The light reflected from the entire moon reaches the earth and it appears like a glowing circular disc.
Thus, on new moon day and a full moon day, earth, sun and moon are almost in one line.
A Full Moon
B New Moon
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.
On the full moon day, the moon is on the opposite side of the earth as that of the sun with respect to earth. The light reflected from the entire moon reaches the earth and it appears like a glowing circular disc.
Thus, on new moon day and a full moon day, earth, sun and moon are almost in one line.
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