-The Sun, Moon, and Earth are part of a larger system that includes other planets and smaller celestial bodies
-The apparent position of the Sun and other stars, as seen from Earth, change in observable patterns
-The apparent position of the Moon, as seen from Earth, and its actual position relative to Earth change in observable patterns
-The regular and predictable motions of the Earth and Moon relative to the Sun explain natural phenomena on Earth, such as day, month, year, shadows, moon phases, eclipses, tides, and seasons