DATE
NAME
CLASS
5:3 EafthMotionsandthe Seasons
fa11
24
Arctic
angles
December2I (22)
equal
length
23Vz
seasons
March 20 (2L)
Earth's axis is tiLted, 4i
of this tilt the
le'g
vernal (spring)
summer solstice
winter solstice
September 22 (23)
Antarctic
equinox
opposite
June 21.(22)
south
degreesfrom the perpendicular to Earth's orbital plane. Because
of daylight changes utr6
lect9c'D5
occur. In addition to daylight
changes,the sun's energy strikes a given location on Earth at different
throughout
the year. When the North Pole of Earth is tilted most directly toward the sun,
stfsli.<-
occurs. N;,*er
from the sun. An
egutrlc:
occurswhenthe North Poleis tilted awav
occurs when Earth's tilt is sidewavs with resoect to the sun. This
occursin Septemberand is calledth"
+4ll
equinox and in March when it is called the
zl Ga\, the vernal equinox occurs
equinox. The summer solsticeoccurson 5ncr
on tl*.tch
:olzl\,
<QPmivt€./\
the winter solstice occurs on Ncerrrferzr(ez)
and the fall equinox occurs on
It should be noted that seasonsin the Northern Hemisphere are
from those in the Southern Hemisphere. The hours of daylight and darkness at the equator are always
about
. Locationsnorbhof the
of daylight on summer solstice,while location.
24 hours of darkness.
Ar-LV
sc'tflr
circlehave --32of the
A.lo**'.-
hours
circle have