Shaped like a ball - round, A round shape. - circle, he big, bright star in the sky during the day. - sun, The bright object in the sky at night. - moon, he study of stars and space. - astronomy, Math about shapes and their properties. - geometry, Math about triangles. - trigonometry, The path something takes as it goes around something else. - orbit, Spinning around. - rotation, Going around something. - revolution, A line something spins around. - axis, Times of the year like winter or summer. - seasons, When day and night are the same length. - Equinox, A tool used to study the stars. - astrolabe, Believing Earth is at the center of everything. - geocentric, Believing the Sun is at the center. - heliocentric, Moving backward. - retrograde, Staying still or moving until something stops it. - inertia, What makes things fall. - gravity, An oval shape - ellipse, A slow movement of the direction something points. - precession, A distance used in space, like between Earth and the Sun. - Astronomical Units (AU), Our galaxy, a group of stars including the Sun. - Milky Way, A person who measured the Earth a long time ago - Eratosthenes, An old idea of how stars and planets move. - Ptolemaic System, A person who said the Sun is at the center, not Earth. - Copernicus, A person who studied stars and planets. - Brahe, A person who said planets move in oval paths. - Kepler, A person who used a telescope to study the sky. - Galileo, A person who talked about gravity and motion. - Newton,

Astronomy

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