The medieval view of the Earth and the planets was the Earth was a motionless object suspended in the middle of the universe, and everything else in the universe, the sun, planets, stars, or any other astronomical objects, revolved around the Earth.
The stars and planets are observed from the earth, and because the earth is rotating and tilting on its axis, and is also orbiting the sun, the stars and planets appear to be moving in relation to the observers view.
The planets don't have to "do anything" to "go into" retrograde motion. The retrograde motion, the "moving backward" that planets do as we watch them cross the night sky over the weeks, is due to the nature of the orbit of a planet and to our view of that orbit from earth.
The four inner, rocky planets (also known as the terrestrial planets) are; Mercury, Venus, Earth and Mars.Mercury, Venus, Earth and Mars
Earth has no planets of its own. It is one and has one moon.
You cannot have planets orbiting planets. Planets orbit suns. Only satellites orbit planets. In the case of planet Earth, the moon is the only natural satellite.
Their called epicycles
Ptolemy's view of the universe is that all celestial objects, including planets, stars, the Sun and the Moon orbit the Earth.
The stars and planets are observed from the earth, and because the earth is rotating and tilting on its axis, and is also orbiting the sun, the stars and planets appear to be moving in relation to the observers view.
he thought the earth revolved around the sun. every one else thought it was the other way round.
The earth is a planet, it has no known planets within.
Astronomers use a telescope to view planets directly.
There are no planets orbiting Earth.
The 'planet' button is in the Toolbar (at top of map). If not present then check Toolbar item in View menu. Planets (Earth, Mars, Moon, Sky) can also be picked in View > Explore menu.
The medieval concept of the universe came from early Christian and scientific points of view. They inherited the notions from the Greeks and Romans and adapted these to Christianity. In this sense, medieval scholars proposed that the earth, as created by God, was the center of the universe. This geocentric concept established that the earth was an unmoving object located in the center of the universe. The scientists and philosophers, Aristotle and Ptolemy helped to develop this geocentric concept of the universe. They concluded that there were lives below and over the moon. They theorized that in the space below earth, water, fire, and air were thought to be the components of earthly bodies. Above, the element of celestial bodies was ether since it was the purest element, closer to heaven, which kept celestial objects above the earth. They conceived that the moon, the sun, and the planets all moved in a perfectly symmetric and circular path around the earth. They also believe that beyond the seven planets, there was a sphere of fixed stars. And, beyond the sphere of fixed stars, there would be Heaven. This was the geocentric idea, as God deliberately placed earth in the center of the universe. These medieval views were proven to be incorrect. Modern scientific discoveries proved that the planets and starts revolve and gravitate around the Sun. It have been demonstrated that there is a gravitation force that keep the bodies stable on earth. Also, the thermodynamics of terrestrial objects have no correlation with the idea of heaven of hell. ma.reyesmariano 5-10-09
They thought Earth was in the center of the universe, so that everything revolves around them. And when you look at the sun, dosen't it seem as if it is revolving around you?
It is best to view any of the planets listed when they are at their greatest eastern or western elongation. This is only a configuration that exists for planets closer to the sun than we are. Elongation refers to the angle of the planet from the sun from earth view. At greatest elongation, they have the farthest possible angle from the sun. This means that the planets are in a place in their orbit where they are brightest and most visible from earth. For planets, farther from the sun than us on earth, the best possible time to view them is when they are in opposition. This refers to the planet being opposite the sun in the sky; this being the obvious opposite of the conjunction configuration where a planet appears behind the sun in the sky.
he thought the sun was in the center of the solar system, and that all the other planets and Earth orbited around it