The solar system model:
The Solar System is the system in which the Earth is located and the other planets orbiting the Sun in their own orbits
In addition, asteroids, meteoroids, comets also orbit the Sun
Ptolemy's model:
Claudius Ptolemy, a geographer, astronomer from Alexandria formulated Ptolemy's model which was a mathematical model of the universe around AD 150
Ptolemy's geocentric model is that the Earth is the center of the universe and is surrounded by the Sun, Moon, planets, and stars
The orbit is perfectly circular
Objects that orbit the Earth move in a circular path (epicycle) and the epicycle moves in a larger circular path around the Earth (deferent)
The equant is the point at which the center of the epicycle is observed to move through the same angle over the same period of time
Copernicus's model:
In the 16th century, an astronomer named Nicolai Copernicus (1473 - 1543) suggested that the Sun was at the center of the Solar System instead of the Earth
Copernicus heliocentric model where the Sun is the center of the universe and is surrounded by the Earth and other planets, the stars are far from this center
The orbit is a perfect circle
Kepler's model:
In 1609 and 1619, Johannes Kepler, a German scientist published a model that is still in use today
Kepler's Law of Planetary Motion there are three laws
Kepler's First Law is the Law of Orbit - all planets move in an elliptical orbital path (two focal points)
Kepler's Second Law is the Law of Extent - a planet moves faster in its orbit and close to the Sun while moving slower if away from the Sun
Kepler's Law Three is the Law of Period - the relationship between the distance of a planet and the duration of a planet to complete an orbit around the Sun
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