Apparent Motion of Venus
All planets in the Solar System revolve around the Sun in a counterclockwise direction when one views them from the north pole of the celestial sphere. Mercury and Venus are inner planets…
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Solar System Simulation
Scale of Solar System
Press the button of the planet you want to go. Orbital radii of the planets has applied the average.
Solar System
Solar System All the orb bodies that revolve around the sun and their space are called the solar system. The celestial bodies that make up the solar system include the eight planets…
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Maximum Elongation of Inner Planets
Maximum Elongation of Inner Planets From the Earth’s perspective, the inner planets seem to stay near the sun. This is because it orbits the inside of the earth.So the inner planets can…
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Apparent Motion of Mars
Apparent Motion of Mars If you observe the motion of Mars, you can see that you go forward and go backward. This procession of Mars has been regarded as mysterious since ancient…
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Galilean Moons
Jupiter, the largest planet in the solar system, has many satellites. Jupiter’s representative satellites are Io, Europa, Ganymede, and Callisto. These four satellites are called Galilean satellites. Galileo observed that these satellites…
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Phase of Venus
What is the difference between Geocentric theory and Copernican theory? What is the phase of Venus, which can not be found in the Geocentric theory?