Section 19-1
EARTH IN SPACE
Today we need to discuss . .
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Moons
Asteroids
Meteors/oids/ites
Comets
Inner planets
Outer planets
Rotisserie
Revolving Door
ROTATION
 Spinning of a
planet around
its axis
 Causes day and
night
REVOLUTION
 Movement of an object around
another object
 Measures a year
How Sunlight hits the Earth
Earth has
seasons
because its
axis is TILTED
o
23½ as it
moves around
the sun.
Equinox
 2 days a year when neither
hemisphere is tilted toward nor
away from the Sun
 Vernal Equinox = (spring) March
 Autumnal Equinox = (fall) September
Equinox
Solstice
 Longest/Shortest days
 Occurs when the Sun is directly overhead
o
23½ latitude N or S
 Winter Solstice = December
 Summer Solstice = June