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The sky is flat, like a sheet of paper, and hence angular diameter is the distance measured along that flat sheet of paper.

If the change in wavelength is less than zero, then the radial velocity tells you that the star is moving _______________ you.

Which of the following is not visible during totality of a total solar eclipse?

At sunset, the ____ Moon phase will be highest above the southern horizon for an observer in the Northern Hemisphere.

The lowest of low tides occurs during neap tides.

Many classical Greek astronomers believed Earth could not move because they detected no parallax.

The equator receives the same amount of sunlight from season to season.

A lunar eclipse can only occur during the full phase.

Light can behave as a particle or as a wave.

The Copernican model of the solar system has the planets orbit the Sun along elliptical paths.