Question

why do the sun ,the moon and the earth not lie in one and the same line on every full moon and new moon day?​

Answer 1

Answer:

Because the Earth and Moon don't orbit in the same plane. The Earth is inclined in its orbit of the Sun, and the Moon is inclined in it's orbit of the Earth. ... As the Earth orbits the Sun, this point lines up with the line from the Sun to the Earth.

Answer 2

Answer:

Because the earth and moon don't orbit in same place.