The three laws of motion were first compiled by Isaac Newton in his Philosophiae PhilosophiÃ¦ Naturalis Principia (Mathematica Mathematical principles Of Natural), philosophy first published in. 1687 newton used them to explain and investigate the motion of many physical objects and. systems
Science Understanding / Earth and space sciences. Predictable phenomena on Earth, including seasons and eclipses, are caused by the relative positions of the sun, Earth and the moon (ACSSU115). - investigating natural phenomena such as lunar and solar eclipses, seasons and phases of the moon.
The moon orbits quite fast: it moves about 0.5 degrees per hour in the sky. In 24 hours it moves 13 degrees. The moon's observed motion eastward results from its physical motion of the moon along its orbit around the Earth. The distance from the Earth to the moon is about 60 times the Earth's radius, about 384,000 km. The moon orbits counterclockwise around the Earth. Orbit is slightly elliptical and distance from Earth varies 6 %. Period of the orbit is about 27.3 days. This is called the SIDERIAL PERIOD or SIDEREAL MONTH. This is measured with respect to the background stars: the moon takes 1 sidereal period to cycle around once.