-Sun crosses the meridian 23.5 degrees lower in altityde than the celestial equator
-Sunset occurs at its farthest point south of due west for the year
-Noontime Sun casts the longest shadows
latitude: there is a unique zero place called the ______ determined by the spinning of the Earth
The Earth's spin determines certain special locations on the Earth.
The spin ____ goes through the North and South Poles
What's the latitude of the North Pole?
Of the equator?
90 degrees North for the North Pole
0 degrees for the equator
A zero longitude place was arbitrarily chosen to be the longitude line that runs through _______, ________
Longitude lines can be numbered in a complete circle of __________,
(but we usually extend them only 180 degrees east of Greenwich and 180 degrees west of Greenwich)
For giving locations more precisely, degrees of latitude or longitude are subdivided into minutes
minutes of arc
If Scorpius is now prominent in the summer sky, in 13,000 years it will be best seen
in the winter sky
Long ago, people believed that there was a giant sphere to which the stars were attached
Unlike longitude, which is measured in degrees and minutes, right ascension is measured in
hours and minutes
The star Wolf 1061 has a parallax of 2.34 arcseconds, while the star Ross 652 has a parallax of 1.70 arc-seconds. What can you correctly conclude?
Wolf 1061 is closer to Earth than Ross 652
A long, thin cloud that stretched from directly overhead to the western horizon would have an angular size of
You note that a particular star is directly overhead. It will be directly overhead again in
23 hours, 56 mins
While watching a star, you see it moves 15 degrees across the sky. How long have you been watching it?
Suppose that instead of being inclined to Earth's orbit around the Sun, the Moon's orbit was in the same plane as Earth's orbit around the Sun. (Click "Show Moon with flat orbit" to see this situation.) In this hypothetical situation, approximately how many solar eclipses would occur each year?
In reality, the Moon's orbit about Earth is tilted (by about 5°) with respect to Earth's orbit about the Sun. As a result, the actual number of solar eclipses that occur each year is approximately _____.
What conditions must exist for a solar eclipse to occur?
Phase of the moon must be NEW and the Moon must be passing through the Earths orbital plane
What conditions must exist for a lunar eclipse to occur?
Phase of the moon must be FULL and the Moon must be passing through the Earths orbital plane
If you could change the layout of the solar system, which of the following would cause a lunar eclipse to occur at least once every month in this hypothetical situation?
Change the moons orbital plane so that it is in the same plan eas the Earth's orbit around the SUn
If the earth rotated on its axis twice as fast as it currently does, but its
motion around the Sun stayed the same, then:
The night would be twice as long.
The fact that the Earth has moved along its orbit in the time it took to rotate once is the reason for
the difference between solar and sidereal time.
Celestial coordinates specify which ______ something is with respect to Earth, but not the distance to the object
For objects within the solar system (comets, planets, moons, asteroids), distance is often specified in
Astronomical Units (AU)