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Unit 7A

Earth's Seasons Vocab.

TermDefinition
rotate to spin on an axis; when Earth does this, we get day and night
axis the imaginary line from the North Pole to the South Pole
tilt the slant of Earth’s axis, which is 23.5 degrees from vertical
revolve to move in a circle around another object
orbital path the path of an object as it revolves around another object
seasons the four natural divisions of the year based on changes in temperature, caused by changes in the angle and intensity of sunlight because of Earth's tilt
hemisphere half of the globe or the celestial sphere
direct in the shortest unbroken line; temperatures are higher when the sunlight is like this
indirect angled or spread out; temperatures are lower when the sunlight is like this
solstice the longest day and longest night of the year; in June and December
equinox the two times when day/night are equal; in March and September
sol- a prefix that means "of or from the sun"
equ- a prefix that means "being equal or balanced"
vernal equinox first day of spring (daylight/night hours equal)
autumnal equinox first day of autumn (daylight/night hours equal)
summer solstice first day of summer (longest daylight hours)
winter solstice first day of winter (longest night hours)
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