ASTRONOMY pndulum provides proof of this daily motion. A swinging pendulum will appear to slowly he Fo or spin of the Earth. A swinging r day is bascd on the re effect, which causes moving objects to get deflected to the right in the Northern Hemisphere Projectiles, oceans, and wind currents demonstrate this action. Our year is based on the de TO Earth's period of revolution, the time needed to complete one orbit. Proos of Orion (a group of ehange direction due to the rotating Earth. Another proof of rotation is the CC are seasons and seasonal stars. If the Earth did not revolve we would experience only one season, since the direct rays would not move to other positions on the seasonal stars). Six months later, due to revolution, Orion is out during the day. This constellation is not visīble due to the bright sun. There are two models of motion for celestial (sky) objects: the geocentric model, and the heliocentric model. In the geocentric model the WaS considered to be the center of the Universe. In the correct model, know as the model, the Sun is the center of the solar system. All planets orbit the Sun attraction of the Sun. The size of the force of gravity between the Earth. During the winter nights, we see the of two objects and the distance between them. As the mass of the This is why Mercury's due to the depends on the objects increase, the gravitational attraction incrcases. As the two objects increases, the gravitational attraction period of revohlution is so fast (88 days) and Phato's orbit, is so slow (247.7 years). This relationship can be stated; the closer a planet is to the Sun the shorter it's period of revolution. The inner planets are rocky and dense. Thus, they are given the namc lanets. The Jovan planets: Jupiter, Saturn, Neptune, and Uranus are the giant gaseous, low- ensity planets. Venus is the hottest planet because of its runaway in which clouds and CO2 trap heat. Vemus is also unique because its period of rotation is longer than its period of revolution. This causes its day to be longer than its year. Celestial objects that do not have an appreciable atmosphere will contain many atmosphere burms up most entering objects. The moon, with no atmosphere, has many craters. Kepler explained how all planets travel in position at a focus. Eccentricity is found by dividing the distance between foci by the length of the major units. The would have a very round orbit. Mercury, with an e of 206, would be much more elliptical Since all planets revolve in an elliptical orbit, their orbital speed increases as they get closer to the Sun and the gravitational attraction increases. The Earth is closer to the Sun in the effect craters. Earth's orbits with the star (sun) in The eccentricity (e) number will always be between 0 and 1 and has no the e mmber, the rounder the orbit. Neptune, with an e of .009, Thus, it has its greatest orbital speed during this scason. Its orbital speed decreases in the summer because it is further from the Sun. Within our Solar System there are meteoroids, Our as it revolves around the Earth. The phases of the moon are caused by the amount of reflected sunlight we see from the moon as the moon revolves around the Earth. There are 8 phases of the moon, they include: new third quarter, old crescent, and new moon. This sequence of phases takes approximately 29 days, very close to a month, to complete. There are two eclipses: the which the moves into the Earth's shadow. Remember the name of the eclipse is the object that is being asteroids, dust, gases, and lots of space. is controlled by the Earth's gravitational attraction. It shows different phases first quarter, new full, old gibbous, moon blocks the Sun, and the eclipse in eclipse in which the full moor blocked. Gneiss Products