Where is the moon?
The moon is a celestial body that is a satellite of the Earth. It is also the second brightest object after the Sun in the night sky, and it is almost always clearly visible from almost anywhere. The Moon is in orbit, having the shape of an ellipse with a semi-axis of about 400 thousand kilometers. This path is located around the Earth, its celestial body passes in a synodic month (where 29.53 Earth days). Together with the Earth, the Moon also rotates around the Sun.
Since ancient times, people have attempted to calculate the location and movement of the moon across the sky. Maps and diagrams were compiled, but still this information from ancient scholars was very approximate. Modern astrologers can calculate the motion and orbit of a celestial body with an accuracy of a centimeter, taking into account such factors as the rotation of the Earth, the attraction of the Sun, the annual removal of the Moon from our planet. By the way, according to modern data, the satellite orbit is, rather, a very slowly unwinding spiral.
For a long time people were interested in such a phenomenon as the phases of the moon. From the point of view of physics, they are the simplest optical effect. But at different times the deepest sacral meaning was invested in them. In fact, it all depends on the sunlight, which reflects the moon. During the lunar month, the heavenly body passes a full cycle, in the days of the new moon, coming too close to the Sun, becoming between it and the Earth, turning towards us the dark side. Therefore, it is invisible. Then the moon "grows", reaches the full moon and "decreases". This phenomenon is called phase.