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Science/ Harbison

Study notes for daylights test.

How does the earth move? 2 major ways, rotation and revolution.
rotation. the spinning of earth on its axis. it causes day and night. 24 hours equals one day
revolution movement of earth around the sun. one complete revolution equals 1 year/ 365 1/4
orbit the path earth moves around the sun non circular it is elliptical
calendar a system to organize time
leap year an adjustment made by the romans to the egyptian calender made to 365 1/4 days feb. 29th
what causes the seasons? the tilted axis as the earth revolves around the sun
summer north end of earths axis tilted towards the sun. june 21 solctice longest day of the year.
winter south end of earths axis tilted toward the sun december 21 solctice shortest day of the year
spring and autumn neither end of earths axis is tilted toward the sun noon sun directly over head 12 hours day and night
vernal/spring equinox march 21 first day of spring
autumnal/fall equinox september 21 first day of fall
Created by: 100002131298553