Chapter 3: Eclipses and the Motion of the Moon

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Terms in this set (...)

annular eclipse
an eclipse of the Sun in which the Moon is too distant to cover the Sun completely so that a ring of sunlight is seen around the moon at mid-eclipse
apogee
the point in its orbit where a satellite or the Moon is farthest from Earth
eclipse
the cutting off of part or all the light from one celestial object by another
eclipse path
the track of the tip of the Moon's shadow along Earth's surface during a total or annular solar eclipse
eclipse year
the interval between successive passages of the Sun through the same node of the Moon's orbit
first quarter moon
the phase of the Moon that occurs when the Moon is 90 degrees east of the Sun
full moon
a phase of the Moon during which its full daylight hemisphere can be seen from Earth
line of nodes
the line where the plane of Earth's orbit intersects the plane of the Moon's orbit
lunar eclipse
an eclipse of the Moon by Earth; a passage of the Moon through Earth's shadow
lunar phase
the appearance of the illuminated area of the Moon as seen from Esrth
new moon
the phase of the Moon when the dark hemisphere of the Moon faces Earth
partial lunar eclipse
a lunar eclipse in which the Moon does not appear completely covered
partial solar eclipse
a solar eclipse in which the Sun does not appear completely covered
penumbra
the portion of a shadow in which only part of the light source is covered by an opaque body
penumbral eclipse
a lunar eclipse in which the Moon passes only Earth's penumbra
perigee
the point in its orbit where a satellite or the Moon is nearest Earth
saros
a particular cycle of similar eclipses that recur about every 18 years
sidereal month
the period of the Moon's revolution about Earth with respect to the stars
solar corona
hot, faintly glowing gases seen around the Sun during a total solar eclipse; the uppermost regions of the solar atmosphere
solar eclipse
an eclipse of the Sun by the Moon; a passage of Earth through the Moon's shadow
synchronous rotation
the rotation of a body with a period equal to its orbital period; also called 1-to-1 spin-orbit coupling
synodic month
The period of revolution of the Moon with respect to the Sun; the length of one cycle of lunar phases. Also called the lunar month.
third quarter moon
the phase of the Moon that occurs when the Moon is 90 degrees west of the Sun
totality (lunar eclipse)
the period during a total lunar eclipse when the Moon is entirely within the Earth's umbra
totality (solar eclipse)
the period during a total solar eclipse when the disk of the Sun is completely hidden
total lunar eclipse
a lunar eclipse during which the Moon is completely immersed in Earth's umbra
total solar eclipse
a solar eclipse during which the Sun is completely hidden by the Moon
umbra
the central, completely dark portion of a shadow
waning crescent moon
the phase of the Moon that occurs between third quarter and new moon
waning gibbous moon
the phase of the Moon that occurs between full moon and third quarter
waxing crescent moon
the phase of the Moon that occurs between new moon and first quarter
waxing gibbous moon
the phase of the Moon that occurs between first quarter and full moon