ENVIRSC 1A03 Lecture Notes - Lecture 5: June Solstice, Arctic Circle, Spheroid
Document Summary
Rotation, longitude and latitude lines are used to define locations on earth. Surface processes all respond to diurnal rhythm. Corrales force is due to earths rhythm. Earth is an oblate ellipsoid: earth is flattened near the poles and bulging around the equator all due to the force of rotation, 2) tilt of earth"s axis. Earth axis of rotation is offset at 23. 5 degrees celsius from the perpendicular plane. The northern axis(north pole) lines with the star polaris. Perpendicular plane = plane of ecliptic: 3) circle of illumination. Separates illuminated portion of earth from non illuminated ( covered portion by sun vs uncovered) The circle touches arctic and antarctic portion at 65 degrees north and south on both solstice. June solstice: june 21st, beginning of summer in northern hemisphere, and winter in southern hemisphere, it is longest day of the year in northern hemisphere and shortest in the southern hemisphere.