which of the following is used by navigators to find their location on Earth by using the stars?
A circle of least confusion
B diurnal circle
C circle of position
D zero hour circle
if a star rises at 8:30 p.m. tonight, it will rise two months from now at
A 8:30 p.m.
B 10:30 p.m.
C 12:30 p.m.
D 4:30 p.m.
what is the altitude of the zenith at 9:00 p.m. on December 21 at a latitude of 40 deg n?
A 0 deg
B 40 deg
C 50 deg
D 90 deg
which of the following is not a cause of the difference between apparent and mean solar time?
A the varying speed of the Earth in its orbit
B the tilt of the equator with respect to the ecliptic
C the rotation of the sun
D none of the above
the right ascension of Orion is 5h30m. what is its hour angle when the sidereal time is 12h?
A 6h30m
B 7h30m
C 5h30m
D 17h30m
what is the sidereal time at 1 a.m. on June 14?
A 3h30m
B 8h30m
C 18h30m
D none of these
the apparent path of the sun is the
A obliquity
B ecliptic
C nadir
D no choice
at what latitudes would a star of declination 90 deg be circumpolar?
A 45 deg n to 90 deg n
B everywhere
C 45 deg s to 90 deg n
D 0 deg to 90 deg n
the motion of the north celestial pole in a circle among the stars every 26,000 years is caused by
A precession
B nutation
C polhodie
D trepidation
the age of Aquarius began when
A the sun moved into Aquarius
B the vernal equinox moved into Aquarius
C the north celestial pole moved into Aquarius
D no choice
the seasons are caused by
A the varying distance from the Earth to the sun
B the tilt of the equator with respect to the ecliptic
C the varying temperature of the sun
D absorbing dust clouds between the Earth and the sun
an object with a declination of +40 deg is observed at a meridian zenith distance of 10 deg n. what is the latitude?
A +50 deg
B +30 deg
C -50 deg
D -30 deg
the point directly over an observer's head is his
A nadir
B south point
C zenith
D no choice
the line of nodes is the intersection of
A the plane of the ecliptic and the plane of the equator
B the plane of the moon's orbit and the plane of the equator
C the plane of the moon's orbit and the plane of the ecliptic
D the epicycle and the deferent
the apparent path of the sun around the celestial sphere against the background of the stars during the year is the
A celestial meridian
B ecliptic
C sun's diurnal circle
D celestial equator
the hour angle of the sun at local apparent noon on July 21 in Greenwich, England is
A 0h
B 8h
C 12h
D 6h
sidereal time would be kept by the sun if
A the Earth moves as it does around the sun
B the Earth didn't go around the sun
C the moon didn't go around the Earth
D no choice
the line of nodes is the intersection of
A the ecliptic and the plane of the moon's orbit
B the equator and the plane of the moon's orbit
C the ecliptic and the equator
D no choice
right ascension is measured along the
A equator
B ecliptic
C horizon
D no choice
it is 9 p.m. on September 21. what is the right ascension of an object with an hour angle of 7h?
A 14h
B 13h
C 4h
D 8h
an object observed at latitude 40 deg n, has a meridian zenith distance of 10 deg s. what is the declination?
A +50 deg
B +30 deg
C -50 deg
D -30 deg
altitude and azimuth are coordinates in the ________system.
A equatorial
B galactic
C horizon
D oblique
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