Full Playlist Fall 2021

Celestial Sphere: Thinking about the sky as the inside of a sphere; defining our coordinate system and key terms.

Circumpolarity: Figuring out what stars appear from north to south no matter where you are on earth.

Sidereal Versus Solar Day: How the combination of terrestrial rotation and revolution leads to stars rising about 4 minutes earlier each night on our solar clock, and leads to the apparent motion of the sun against the background stars.

Visibility of the moon at different phases: Follow the sketch of the Earth/Sun/Moon system geometry to see why we see waning moons after sunrise in the morning and waxing moons before sunset in the evening.