Exam 2: A Users Guide to the Sky

An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?

A(n) ____ is 1/60th of a minute of arc.

The ____________________ is the point on the celestial sphere directly above an observer, regardless of where the observer is located on Earth.

A second magnitude star in Ursa Major is brighter than a fourth magnitude star in Orion.

An observer in the Northern Hemisphere watches the sky for several hours. Due to the motion of Earth, this observer notices that the stars near the north celestial pole appear to move

Table 2-1 -Refer to Table 2-1. Based on the information in the table, what is the ratio of the intensity of Dra to that of Nim?

Stars in the same constellation

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

The apparent visual magnitude of a star is a measure of the star's

A 3rd magnitude star is 3 times brighter than a 1st magnitude star.

Seen from the northern latitudes, the star Polaris

____________________ is a measure of the light energy that hits one square meter in one second.

An observer on Earth's equator would find

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

An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?

A(n) ____ is 1/60th of a degree.

The constellation of Orion is currently visible in the evenings in January. Precession will not affect this and Orion will still be visible in January 13,000 years from now.

A sketch of the Earth with its north and south poles and equator is shown. The zenith is located in the sky over your head if you are at

How much of the night sky is north of the celestial equator?

If an observer walks north toward increasing latitude, the number of circumpolar stars would