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Motions of the Earth and Moon

review terms connected with above topic

AB
rotationto turn on an axis; one rotation = 24 hrs.
axisimaginary line from pole to pole
time zonesoccur approx. every 15 degrees longitude(24 in all)
inclinationtilt--earth's is 23.5 degrees-causes seasons
orbitpath taken during revolution
revolutionmovement of one heavenly body around another
summer solsticemost hrs. daylight; about June 22
winter solsticeleast daylight, most hrs. darkness; about Dec. 22
vernal equixoxhours of day and night equal; sun directly over equator
tropic of cancerdirect rays of sun strike here at summer solstice
tropic of capricorndierct rays of sun strike here at winter solstice
autumnal equinoxlength of day and dark equal; about Sept. 22
phases of moonchanges in appearance of moon as revolves around earth, due to light reflected from Sun; one complete cycle takes approx. 28 da.
new moondisk of moon not visible
waxinggrowing larger
first quarter moonright 1/2 of moon is illuminated
full moonfull disk of moon illuminated; occurs approx 7 da. after first qtr.
last (third) quarter moonleft 1/2 of moon is illuminated, occurs approx 7 da. after full
gibbousrounded on both sides
waninggrowing smaller
lunar eclipseearth's shadow obscures the moon
unbrazone of complete shadow
penunbrazone of partial shadaw
solar eclipsemoon's shadow falls on earth
synchronous rotationaccounts for why we see only one side of the moon


Pam Leach

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