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 depicts the photograph taken by the observer,which direction was the camera pointing?

-Which star in Table 2-1 would not be visible to the unaided eye of an observer on Earth?

You live at a latitude of 28 $\degree$ N.What is the angle between the northern horizon and the north celestial pole?

-Based on the information in Table 2-1,what is the ratio of the intensity of $\delta$ Dra to that of Nim?

You live at a latitude of 39 $\degree$ S.What is the angle between the southern horizon and the south celestial pole?

Precession of Earth's axis causes the date at which perihelion of Earth's orbit occurs to slowly change.

If you were standing on the Earth's equator,which of the following points in the sky would pass through your zenith at some time during one full day (24 hours)?

The sun moves ____ along the ecliptic among the stars.

The magnitude scale

____ is the brightest star in the constellation of Ursa Majoris.

If you point toward the zenith right now and then point there again 6 hours later,you will have pointed twice in the same direction relative to

Precession of the rotation axis of Earth takes ____ to complete a cycle.

As seen from the earth,the sun appears to move ____ along the ____ among the stars.

At the time of the winter solstice (the start of winter)the sunlight is at a lower angle and thus is ____ than(as)in the start of summer.

During the month of June the north celestial pole points approximately toward Polaris but during the month of December it points

In the Milankovitch theory,the elliptical shape of the Earth's orbit,its axis tilt,and axis precession vary with time.These combined at times to create ____ on Earth.

At the Earth's north pole,the north celestial pole is directly overhead and stars near the horizon travel in straight lines...

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

What is the approximate latitude of the observer in the diagram below?

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