Chapter 2 - Knowing the Heavens
From Chapter Two of Universe (9th Ed.)
Terms in this set (41)
A circle of latitude 23 1/2° north of Earth's south pole.
Apparent Solar Day
The interval between two successive transits of the Sun's center across the local meridian.
Apparent Solar Time
Time reckoned by the position of the sun in the sky.
A circle of latitude 23 1/2° south of Earth's north pole?
The intersection of the elliptic and the celestial equator where the Sun crosses the equator from north to south. Also used to refer to the date on which the Sun passes through this intersection.
A great circle on the celestial sphere 90° from the celestial poles.
An imaginary sphere of very large radius centered on an observer; the apparent sphere of the sky.
A term describing a star that neither rises nor sets but appears to rotate around one of the celestial poles.
A configuration of stars in the same region of the sky.
Angular distance of a celestial object north or south of the celestial equator.
Any apparent motion in the sky that repeats on a daily basis, such as the rising and setting of stars.
The apparent annual path of the sun on the celestial sphere.
The plane of the Earth's orbit around the sun.
The date used to define the coordinate system for objects on the day.
One of the intersections of the ecliptic and the celestial equator. Also used to refer to the date on which the Sun passes through such an intersection.
The half of the meridian that lies below the horizon.
Mean Solar Day
The interval between successive meridian passages of the mean Sun; the average length of a solar day. (24 hours)
A fictitious object that moves eastward at a constant speed along the celestial equator, completing one circuit of the sky with respect to the vernal equinox in one tropical year.
The great circle on the celestial sphere that passes through an observer's zenith and the north and south celestial poles.
The crossing of the meridian by any astronomical object.
North Celestial Pole
The point directly above the earth's north pole where Earth's axis of rotation, , if extended, would intersect the celestial sphere.
The study of the apparent positions of the planets and stars and how those positions change.
A slow, conical motion of the Earth's axis of rotation caused by the gravitational pull of the Moon and Sun on the Earth's equatorial bulge.
Precession of Equinoxes
The slow westward motion of the equinoxes along the ecliptic due to the procession of Earth.
The coordinate for measuring the east-west positions of objects on the celestial plane.
A clock that measures sidereal time.
The interval between successive meridian passages of the vernal equinox.
The time reckoned by the location of the vernal equinox.
The orbital period of Earth about the Sun with respect to the stars.
South Celestial Pole
The point directly above the earth's south pole where Earth's axis of rotation, if extended, would intersect the celestial sphere.
The point of the ecliptic where the Sun is farthest north of the celestial equator. Also used to refer to the date on which the Sun passes through this point.
A region of earth where, by agreement, all clocks have the same time.
The period of revolution of Earth about the Sun with respect to the vernal equinox.
Tropic of Cancer
A circle of latitude 23 1/2°, north of the Earth's equator.
Tropic of Capricorn
A circle of latitude 23 1/2°, south of the Earth's equator.
The half of the meridian that lies above the horizon.
The point on the ecliptic where the Sun crosses the celestial equator from south to north. Also used to refer to the date on which the Sun passes through this intersection.
The point on the ecliptic where the Sun reaches its greatest distance south of the Celestial equator. Also used to refer to the date on which the sun passes through this point.
The point on the celestial sphere directly overhead an observer.
A band of 12 constellations around the sky centered on the elliptic.
The points about which the celestial sphere appears to rotate. (See also North/South Celestial Pole)
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