The Movement of Member of Solar System
The member of Solar System in revolving the sun has two movements those are rotation and revolution. Rotation, that is motion of celestial body in orbiting its axis. Rotational period is time used for one rotation. Meanwhile Revolution, that is motion of celestial body in orbiting the sun. Revolution period is the time required for one revolution.
In the below is discussed several theories about the motion of celestial bodies.
1. Geocentric Theory
This theory is stated by Claudius Ptolemaeus (in 2nd century AD), that states: “All of celestrial bodies circulate orbiting the Earth, the position of Earth in outer space is center of circulation.”
2. Heliocentric Theory
It is stated by Nicholas Copernicus, from German (1472-1543) that states: “Not earth is the circulatory center of celestial bodies, but the sun is at the center of circulation of celestial bodies.”
This theory is found in the book titled: “De Revolutionimbus Orbium Coelestium”. Because of that theory, Copernicus is given nickname that is The Father of Pioneer of Modern Astronomy. Supporters of Heliocentric theory among other are Galileo-Galilei and Issac Newton (Founder of Gravitational theory).
The content of Gravitational theory are as follows:
a. Every celestial body in this universe has gravitation.
b. Between one body to another attract each other.
c. Planets revolve the sun and do not exit from their orbit, because the presence of gravitational force.
The member of Solar System in revolving the sun has two movements those are rotation and revolution. Rotation, that is motion of celestial body in orbiting its axis. Rotational period is time used for one rotation. Meanwhile Revolution, that is motion of celestial body in orbiting the sun. Revolution period is the time required for one revolution.
In the below is discussed several theories about the motion of celestial bodies.
1. Geocentric Theory
This theory is stated by Claudius Ptolemaeus (in 2nd century AD), that states: “All of celestrial bodies circulate orbiting the Earth, the position of Earth in outer space is center of circulation.”
2. Heliocentric Theory
This theory is found in the book titled: “De Revolutionimbus Orbium Coelestium”. Because of that theory, Copernicus is given nickname that is The Father of Pioneer of Modern Astronomy. Supporters of Heliocentric theory among other are Galileo-Galilei and Issac Newton (Founder of Gravitational theory).
The content of Gravitational theory are as follows:
a. Every celestial body in this universe has gravitation.
b. Between one body to another attract each other.
c. Planets revolve the sun and do not exit from their orbit, because the presence of gravitational force.
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