Unit #1: Measuring The Earth

Parallel Lines on flat map. Concentric circles on a globe as viewed from the North Pole Latitude

The angular distance North or South of the Equator. Latitude Lines are called parallels Equator = 0 ⁰ New York 42⁰N North Pole = 90⁰ N South Pole = 90⁰ S

Angular Distance North or South of the Equator

*Important Lines of Latitude* Equator = 0 ⁰ Tropic of Cancer = 23.5 ⁰N Tropic of Capricorn = 23.5 ⁰S Arctic Circle = 66.5 ⁰N Antarctic Circle = 66.5 ⁰S North Pole = 90 ⁰N South Pole = 90 ⁰S

Longitude Angular Distance East or West of the Prime Meridian Prime Meridian(Greenwich England) = 0 ⁰ International Dateline = 180⁰ Every 15⁰ of Longitude = 1 hour time difference 45⁰ = ________hrs 5 hrs =________⁰ East is later West is Earlier

Calculating your Longitude If a sailor is at 75 ⁰W longitude and it is noon at his location. What time is it GMT 75/15 = 5hrsWest is earlierGMT= 5pm If it is 3pm GMT and it is 7pm at your location, what is your longitude. 3pm to 7pm is 4 hours 4 X 15 = 60Later is East You are at 60⁰E

General Ideas on Longitude Longitude Lines meet at the poles. Largest Longitude is 180 ⁰ Hemispheres –Western –Eastern

New York State and USA Approximate Latitude of New York = 42 ⁰N Approximate Longitude of New York = 74 ⁰W

Important Lines of Longitude Prime Meridian International Dateline

Earth seen from Apollo 17

Earth seen from Clementine

Earth seen from Galileo