AA 100 Lecture Notes - Lecture 3: Analemma
29 Aug 2016
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Lecture notes chapter 2. 2 (the reason for seasons) Seasons are opposite in the northern and southern hemispheres. The earth is closest to the sun in january (3rd-4th). The earth orbits the sun in an eclipse. During the summer, the rays hit earth more directly (direct sunlight), and indirectly during winter (indirect sunlight). Seasons also have to do with the hours of sunlight. During the summer, the days are longer and nights are shorter, so the sun"s rays hits the earth longer. Solstices: marks the beginning of summer and winter with the longest and shortest days of the year, respectively. Equinox: marks the beginning of spring and fall with equal parts day and night (12 hour day, 12 hour night). Am/pm means before meridian and after meridian, respectively. This is because in ancient times, noon was when the sun hits the meridian/is at the zenith. Analemma: the figure-eight pattern the sun makes as the earth moves during the year.
