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These two short online tutorials discuss how the earth rotates and then the earth's revolutions.

This online tutorial will explain the earth's shape and its hemispheres.

This online article delves into our the sun and planets were formed.

This online resource explores the following topics:

• Latitude and parallels
• Longitude and meridians
• Climate and latitude
• Time zones

Other objects in the solar system are discussed in this online textbook viz. asteroids, meteorites, comets and dwarf planets.

This online resource introduces the geocentric and heliocentric models. Exoplants, planets and their motions, planetary orbits, the role of gravity and how the solar system was formed are also covered. 

This online resource investigates the internal structure, outer layers and surface features of the sun.

This online resource explores the terrestrial, or inner, planets - the planets closest to the sun: Mercury, Venus, Earth and Mars.