The moon revolves around the earth. Each round begins when the moon passes between the earth and the sun, now called the new moon, or just new moon. It would be logical to deduce that each circle around the earth, is in the same place - ie in the direction of the sun - a new moon. But no: the new moon occurs every time after a full circle ... and a little bit.
To return to the same starting point of the moon takes 27 days and almost 8 hours, but to really reach the point of the new moon, you need an extra effort and it is around 29 days, and almost 13 hours. Why? Why
same time the earth turns slowly around the sun and the moon and then to return to line up on the main floor - every time the sun must compensate for the displacement (apparent) of the sun with a part of the way more than the full turn. However, it is easier to look at an animation that explain it.
Oh I forgot, tomorrow is the New Moon.
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