Microorganisms causing diseases that characteristically are waterborne prominently include protozoa and bacteria, many of which are intestinal parasites, or invade the tissues or circulatory system through walls of the digestive tract. Various other waterborne diseases are caused by viruses.
As the Moon revolves around Earth, both objects also progress in orbit around the Sun. After completing one revolution with respect to the stars, the Moon must continue a little farther along its orbit to catch up to the same position it started from relative to the Sun and Earth.
The technical term for it is apogee. The moon does not revolve around the Earth in a perfect circle. It varies by a few thousand miles. If you were to look at the moon at Apogee, it would be smaller than if it was at perigee(when it is closest to the Earth). The difference in distance effects tides in the ocean, and other things on Earth.