Chapter 0
The time for the Moon to orbit Earth, relative to the stars is: 27.3 days. 29.5 days. 18 years, 11.3 days. 23 hours, 56 minutes.
27.3 days.
The synodic month is: 29.5 days. based on the Moon's position relative to the stars. the basis of the year we use in our modern calendar. caused by both the Earth's and Moon's rotations.
29.5 days.
True/False A tropical year is the same as a sidereal year.
F
True/False Constellations are close clusters of stars, all at about the same distance from the Sun.
F
True/False Latitude and right ascension are coordinate systems used to find objects on the celestial sphere.
F
True/False Right ascension in the sky is very similar to latitude on the Earth.
F
What are constellations? Ancient story boards, useless to modern astronomers. Groups of stars making an apparent pattern in the celestial sphere. Groups of stars gravitationally bound and appearing close together in the sky. Groups of galaxies gravitationally bound and close together in the sky.
Groups of stars making an apparent pattern in the celestial sphere.
True/False In the sky, declination is measured in degrees north or south of the celestial equator.
T
True/False Only people in the Moon's umbral shadow can see a total solar eclipse.
T
True/False The celestial sphere is divided into 88 modern constellations.
T
True/False The larger the parallax shift, the closer an object is to us.
T
True/False The parallax shift for all stars is very small.
T
True/False The sidereal day is determined by the Earth's rotation with respect to the stars.
T
True/False The south celestial pole is located at a declination of -90 degrees.
T
True/False The synodic month is longer than the sidereal month.
T
True/False The vernal equinox marks the beginning of spring in the northern hemisphere.
T
True/False Time zones were created to standardize time between different locations.
T
When the Moon is directly opposite the Sun in the sky, its phase is: waxing or waning crescent. full. new. first or third quarter.
full.
The phenomenon that causes the sidereal year to be about 20 minutes longer than the tropical year is called: revolution. regression. precession. the Earth's rotation.
precession.
The twelve constellations the solar system bodies move through are the: equatorial constellations. galactic equator. nodes of the ecliptic. signs of the zodiac.
signs of the zodiac.
The season with the longest day in the Northern Hemisphere is: summer solstice winter solstice autumnal equinox vernal equinox
summer solstice
The fact that the Earth has moved along its orbit in the time it took to rotate once is the reason for: precession. the difference between solar and sidereal time. seasons. the position of the Celestial Equator.
the difference between solar and sidereal time.
What causes the seasons to change? the varying distance between the Earth and the sun. precession. parallax the tilt of Earth's axis of rotation relative to the ecliptic.
the tilt of Earth's axis of rotation relative to the ecliptic.
