Mastering Astronomy Ch. 2 Qz
During the winter in the northern hemisphere, earth's axis points toward the star Polaris. In the spring in the northern hemisphere, Earth's axis
Also points toward Polaris.
A sundial measures
Apparent solar time
Why is the solar day longer than the sidereal day?
Because the earth has moved in its orbit during the time of one rotation
When we see Saturn going through a period of apparent retrograde motion, it means
Earth is passing Saturn in its orbit, with both planets on the same side of the Sun
If the Sun rises precisely due east,
It must be the day of either the spring or fall equinox.
The time it takes for the Earth to complete one revolution around the sun with reference to the stars is called a/an
Sidereal Year
If there is going to be a total lunar eclipse tonight, then you know that
The Moon's phase is full.
The fact that we always see the same face of the Moon tells us that
The Moon's rotation period is the same as its orbital period.
The month is based on what celestial motion?
The time it takes for the moon to complete one revolution around the Earth.
A week after full moon, the Moon's phase is
Third quarter.
Beijing, china and Philadelphia, PA, USA have about the same latitudes but very different longitudes. Therefore, tonight's night sky in these two places
Will look about the same
When it is summer in Australia, it is
Winter in the United States
The north celestial pole is 35 degrees above your northern horizon this tells you that
You are at latitude 35 N
Two stars that are in the same constellation
may actually be very far away from each other
Planets beyond earth will appear brightest when the are at
opposition