GLY 1001 Earth Science Name:___________________
Chapter 21 Part K: Key Terms
Fill in
the blanks with the word(s) that best fit the description:
1.
__________________ – the place in the
orbit of a planet where the planet is farthest from the Sun
2.
__________________– An imaginary hollow
sphere upon which the ancients believed the stars were hung and carried around
the earth
3.
__________________ – An apparent group of
stars originally names fir mythical characters. The sky is presently divided
into 88 of the these groups.
4.
__________________ –The angular distance
north or south of the celestial equator denoting the position of a celestial
body.
5. __________________ – The yearly path of the Sun plotted against the background of the
stars.
6.
__________________ – The view that the
Sun is at the center of the solar system.
7.
__________________– An eclipse of the
moon.
8.
__________________– The average time
between two passages of the Sun across the local celestial meridian.
9.
__________________ – The point in the
orbit of a planet where it is closest to the sun.
10.
__________________– The gravitational
disturbance of the orbit of one celestial body by another
11.
__________________- The imaginary plane
that connects Earth’s orbit with another celestial sphere
12.
__________________ - A slow motion of Earth’s axis that
traces out a cone over a period of 36,000 years
13.
__________________ - The motion of one
body about another, as the Earth about the sun.
14.
__________________– An angular distance
measured eastward along the celestial equation from the vernal equinox
15.
__________________ – The spinning of a
body such as the Earth, about its axis.
16.
__________________– An eclipse of the
Sun
Chapter 21 Word List:
Aphelion Astronomical unit Celestial sphere Constellations Declination Ecliptic Equatorial system Geocentric Heliocentric |
Lunar eclipse Mean solar day Perihelion Perturbation Phases of the moon Plane of the ecliptic Precession Ptolemaic system Retrograde motion |
Revolution Right ascension Rotation Sideral day Sideral month Solar eclipse Synodic month |
Words Not Used for Fall 2006 test:
Astronomical
unit (AU) – Average distance from the earth
to the Sun; 1.5 x 108 km or
93 x 106 miles
Equatorial
system – A method of locating stellar objects much like the
coordinate system used on the Earth’s surface.
Geocentric – The concept of an Earth-centered universe.
Phases
of the moon – The progression of chances in the
Moon’s appearance during the month.
Ptolemaic
system – An Earth-centered system of the universe.
Retrograde
motion – The apparent westward motion of the planets with
respect to the stars.
Sideral day – The period of
Earth’s rotation with respect to the stars.
Sideral month – A timeperiod based on the revolution of the Moon around the
earth with respect to the stars.
Synodic month – The period of revoltion of the Moon with respect to the Sun, or its cycle
of phases.