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Planet
A celestial body moving in orbit around a star, which is spherical in shape, and has enough mass to clear its orbit of other similar sized bodies. Earth is a planet.
Natural Satellite
A naturally existing celestial body that revolves around a
planet.
Geocentric
A model which places Earth at the center of the Universe.

Heliocentric
A model which places the sun as the central object in the solar system.

Aristotle
Greek philosopher who promoted geocentrism.
Eratosthenes
North African librarian who calculated the circumference of the Earth using geometry and shadows.
Ptolemy
Greek Mathematician who formalized the geocentric model.
Copernicus
Polish astronomer who promoted heliocentrism.
Tycho Brahe
Danish astronomer who made meticulous observations of planetary movement and catalogued over 1000 stars.
Galileo
Italian polymath who improved the design of the telescope and used his observations to prove heliocentrism.
Kepler
German astronomer who developed the laws of planetary motion.
Newton
English mathematician who developed calculus and the Laws of Motion.