The Geocentric Theory and the Copernican Theory
Name of the Orb Run The Geocentric theory The Geocentric theory is a cosmic perspective in which the Earth is at the center and all the stars revolve around the Earth. From…
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Astronomy
Why does the moon rise 50 minutes later each day?
Run Why does the moon rise 50 minutes later each day? As the earth spins once a day, the moon moves slightly eastward. So it takes 50 minutes longer than 24 hours…
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Diurnal Motion of North Sky (WebGL)
Pin the Earth * This is a web page using WebGL technology and do not work in Internet explorer. Diurnal Motion Fix the camera towards the Polaris at night. When you shoot…
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Foucault Pendulum (WebGL)
Earth fixed Latitude * This is a Web page using WebGL technology and do not work in Internet explorer. Foucault’s pendulum is a device invented by French scientist Leon Foucault to prove…
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Earth’s Revolution and Seasons (WebGL)
Zoom View * This is a Web page using WebGL technology and do not work in Internet explorer. Earth Rotation and Seasonal Changes The Earth’s axis of rotation is tilted at an…
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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…
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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…
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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.…
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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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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?