Understand how the sun's declination migrates between 23.

Understand how the sun’s declination migrates between 23.5°N and S, or the Tropic of Cancer and Tropic of CapricornUnderstand why the sun’s direct rays are never 90° (the noon sun directly overhead) to the Earth’s surface at any latitude higher than 23.5°N or SOur revolution around the sun, rotation, and Earth’s tiltUnderstand why we have solstices and equinoxes: Where is the Earth in its revolution? Where is the sun in the sky? What latitude is receiving direct rays at that time and date of a solstice or equinox?