Natural Resources Canada
www.nrcan.gc.ca
Natural Resources Canada > Earth Sciences Sector > Priorities > Canadian Spatial Reference System
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Canadian Spatial Reference System
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Height Reference System Modernization
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Canadian Spatial Reference System
Gravity
Your pencil rolls off the desk and falls to the floor. You throw a ball - it lands on the ground. Tides rush in and out of the Bay of Fundy. You would weigh less on the Moon than on Earth.
Why?
The answer is gravity.
http://www.geod.nrcan.gc.ca/edu/geod/gravity/index_e.php
