Solar system making
Movement of the planets of the solar system The planets in the solar system receive gravity from the Sun and revolve around it due to this gravity. The following is a table of the orbital radius … more
Astronomy Simulation
Why the Universe Looks Dark (The Expansion of the Universe)
Why does the night sky look dark? It’s dark at night. This seems obvious, but you’ll find something strange if you think about it a little. Shouldn’t the universe be bright if the night sky is … more
Principle of Speed Gun
Doppler effect Electromagnetic waves (or sound waves) come into contact with another object while traveling; part of the wave is absorbed or reflected. A moving ball likewise absorbs or reflects some of the incoming waves. If … more
Day and Night, Seasons, White Night, Polar Night
* If you are asked to access your location, please allow it. * Your personal data is not stored on the server. * For iOS devices, please allow location access as follows. Day and night The … more
Phase of the Moon
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The Diurnal Motion and the Zodiac
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Diurnal Motion (WebGL)
* If you are asked to access your location, please allow it. * Your personal data is not stored on the server. * For iOS devices, please allow location access as follows. Diurnal Motion Fix the … more
Diurnal Motion of Sun
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Distance of 1 pc(parsec)
Parallax When an object is close to me, you can use a ruler to measure the distance. But, it isn’t easy to measure when the object is away from me. In this case, how can you … more
Earth’s Revolution and Seasons (WebGL)
Earth Rotation and Seasonal Changes The Earth’s rotation axis is tilted at an angle of about 23.5 ° to the orbital axis. Because of this inclination, seasonal changes occur like spring, summer, autumn, and winter. The … more
Phase of the Moon 3
* If you are asked to access your location, please allow it. * Your personal data is not stored on the server. * For iOS devices, please allow location access as follows. It is only the … more
Cassegrain Reflector
Cassegrain Reflector The Cassegrain reflector(telescope) was designed by French engineer Laurent Cassegrain to compensate for the shortcomings of the Newtonian telescope. Light reflected by the concave mirror is incident on the convex mirror. Focus is created … more