Exam 2: User's Guide to the Sky

Table 2-1 Star Nane Apparent Visual Magnitude d Dra 3.07 a Cet 2.53 Nirl 8.07 \alpha CMa -1.46 -Refer to Table 2-1.Which star in the table would be invisible to the unaided eye of an observer on Earth?

How do tidal forces affect the rotation of celestial bodies and their orbital motion?

In what season is the constellation of Orion most visible in Canada?

The Earth is closest to the Sun during the month of January.Yet we do not experience our hottest weather in January.Explain why not.

Where in the sky would an observer at the Earth's equator see the celestial equator?

On a clear night,when an observer in Vancouver sees a first quarter Moon,what would an observer in St.John's see?

An observer in the northern 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?

Why does the Gregorian calendar use leap years?

The ____________________ period of the Moon is the time required for one revolution of the Moon around the Earth with respect to the stars.

What is the term for the point in the Earth's orbit where the Earth is closest to the Sun?

Why can neither Venus nor Mercury remain visible throughout the night as the full Moon does?

A total solar eclipse occurred in Brandon,Manitoba on Feb.26,1979.At what other date was there (will there be)the same eclipse visible at this location?

For an observer in Valdivia,Chile,at a latitude of 39° South,what is the angle between the southern horizon and the south celestial pole?

Which of the following constellations is visible year-round in most of Canada?

If an observer travels north,toward higher latitudes,how does the number of circumpolar stars that he or she sees in the sky change?

Give two reasons why summer days are warmer than winter days.

The Moon's umbral shadow usually does not produce a total solar eclipse.Why not?

When do total lunar eclipses always occur?

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

During a total lunar eclipse,where is the Moon?