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The celestial equator always crosses the horizon at the east point and west point.

300-nm light has a lower frequency than 500-nm light.

A(n) ____ is a set of beliefs that appears to be based on scientific ideas, but which fails to obey the most basic rules of science.

During one day and night in the mid-northern hemisphere, the stars near the north celestial pole

In the designation α Canis Majoris, which part refers to the star and which part refers to the constellation?

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.

At any point in its orbit, exactly one half of the Moon is illuminated by the Sun.

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

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

The total amount of illumination changes during the lunar cycle of phases.