Exam 2: User's 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?

Describe the location of Polaris in the sky relative to the horizon as seen by observers in Yukon (lat.= 60° N),Texas (lat.= 33° N),Ecuador (lat.= 0°),and Australia (lat.= 30° S)

Where is an observer's nadir?

The constellations were created by the Greeks.

Star A has an apparent visual magnitude of 6.3 and star B has an apparent visual magnitude of 5.3.Star A is ____________________ than star B.

For a northern hemisphere observer,the __________ __________ Moon is visible in the south-eastern sky just after sunset.

For an observer in Pond Inlet,Nunavut,at a latitude of 73° North,what is the angle between the northern horizon and the north celestial pole?

When and where is a third quarter Moon visible?

The umbra of the Moon's shadow is the region from which no part of the photosphere is visible.

Explain why people who live close to the equator do not experience major temperature changes in the seasons.

For an observer in New Delhi,India,at a latitude of 28° North,what is the angle between the northern horizon and the north celestial pole?

A lunar eclipse can only occur during the full phase of the Moon,i.e.when the Moon is full.

What is the angle between the noon Sun at the vernal equinox and the southern horizon for an observer at a latitude of 38° North?

If the Moon's orbital plane was aligned with the celestial equator,when would eclipses occur?

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

Why isn't the winter solstice the coldest day of the year?

Why does one cycle of lunar phases take 29.53 days,even though the Moon orbits the Earth in 27.32 days?

Describe how a small change in the relative distance of the Earth from the Sun at perihelion could affect the formation of glaciers on Earth.

Relative to the stars,the Moon moves eastward in the sky each night.About how far does it move?

If you lived on the near side of the Moon,how often would the Earth set below your horizon?