GEOG102 Study Guide - Final Guide: June Solstice, March Equinox, September Equinox

• School: University of Waterloo
• Department: Geography and Environmental Management
• Course: GEOG102
• Professor: Ellsworth Ledrew

Document Summary

Earth"s or(cid:271)it: average distance from earth to the sun is 150,000,000 km (93, 000, 000 mi, perihelion closest at january 3. 147,255,000 km (91, 500,000 mi: aphelion farthest at july 4. 152,083, 000 km (94, 500,000 mi: pla(cid:374)e of earth"s or(cid:271)it is the plane of the ecliptic. Olsti(cid:272)es: spe(cid:272)ifi(cid:272) poi(cid:374)ts i(cid:374) ti(cid:373)e at (cid:449)hi(cid:272)h the u(cid:374)"s de(cid:272)li(cid:374)atio(cid:374) is at its positio(cid:374) farthest (cid:374)orth at the tropic of cancer or south at the tropic of capricorn. For locations between about 66. 5 n and 90 n (the north pole), the sun remains below the horizon the entire day. The parallel at about 66. 5 n marks the arctic circle; this is the southernmost parallel (in the. Northern hemisphere) that experiences a 24-hour period of darkness: twilight and dawn provide some lighting for over a month at beginning and end of arctic. Night: dawn: period of diffused light that occurs before sunrise, twilight: period of diffused light that occurs after sunset.