Circular Shadow, The specific shape of the shadow cast by the Earth on the moon during a lunar eclipse, which Greeks used as primary evidence to prove the Earth is a sphere, Eratosthenes, The Greek mathematician who calculated the Earth's circumference by comparing the angles of shadows in the cities of Syene and Alexandria during the summer solstice, Diurnal Motion, The term for the apparent daily motion of stars and celestial bodies across the sky caused by the Earth’s rotation, Copernican System, The model of the universe that identifies the Sun as the center, with the Earth and other planets revolving around it, Law of Equal Areas, The planetary law which states that a planet moves fastest when it is nearest to the sun, Annual Motion, The term for the apparent yearly motion of stars and celestial bodies across the sky caused by the Earth’s revolution around the sun, Precession, The slow, continuous "wobbling" of the Earth’s axis of rotation caused by the gravitational pull of the moon and sun, completing a cycle every 26,000 years, Solstices, The two days in a year when the sun reaches its farthest declination (highest or lowest point) from the celestial equator, Zodiac, A band of thirteen constellations visible along the ecliptic path that ancient civilizations used to track months and planting times, Planetes, The Greek term meaning "wandering stars," used to describe the seven celestial bodies (including the Sun, Moon, and five visible planets) that move differently than the fixed stars

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