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You are in the northern hemisphere and the season is winter. The Sun is above a geographic point in the southern hemisphere and below the celestial equator.

The geometry of an ellipse is described by two numbers: the ____ which is half the longest diameter of the ellipse and the ____ which tells us the shape of the ellipse.

An absorption spectrum is also called a bright-line spectrum.

As Earth rotates, circumpolar stars appear to move counterclockwise around the north celestial pole.

If you are standing on the floor then your action (or lack of action) can count as a test of

You are standing near a railroad track and a train is moving toward you at 60 mph and blowing its horn. What will you notice as the train moves past you?

Earth’s atmosphere is fully transparent only to visible and radio light.

An observer at Earth’s geographic north pole would find _______

All the constellations in the sky were created by the Greeks.

When two objects of unequal masses orbit each other, the center of mass is