KEY CONCEPT Earth rotates on a tilted axis and orbits the Sun.

Which observation is a direct result of the 23½º tilt of Earth's axis as Earth orbits the Sun? 1) Locations on Earth's Equator receive 12 hours of daylight every day. 2) The apparent diameter of the Sun shows predictable changes in size. 3) A Foucault pendulum shows predictable shifts in its ................
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