Horizontal Coordinate System
Touch the screen to move the position of the star. How many numbers do we need to indicate the position of the star? After some time, is this star in the same position or go elsewhere? What are the weak…
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Astronomy
Why do we see only one side of the moon?
Why do we always see the same side of the moon? The moon’s rate of rotation and rate of revolution is the same
Diurnal Motion of Sun
Diurnal Motion is the changing view of the sky seen as the Earth rotates on its axis. What is the change in the movement of the sun during one year? What changes will occur around us as the sun’s movement…
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Foucault Pendulum
Earth globe photo credit: Fineartamerica.com Foucault’s pendulum is a device invented by French scientist Leon Foucault to prove the Earth’s rotation In 1851. The fact that the Earth rotates has been known for a long time, but it is the…
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Doppler Effect and RedShift
Most of the distant galaxies are moving away from our galaxy. Only a fraction of galaxies like Andromeda are coming to us. Scientists have found these things simply by observing the universe. How did you find out?
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 in the Solar System. They are closer to…
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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?
Scale of Solar System
Click the button to move to the planet you want. Is it closer than you think? If not, why?
Daylight Map
The sun icon has been displayed if the sun is located on the zenith. The shaded area is at night. Find out where ‘midnight sun’ happens.
