Boat 800000 ya
Wheel 6000 ya
Hawaii humanned 15kya from Polynesia
1 knot is 1.1 mph
Catamaran can 50 mph
1700ad. Best ships 400 mp day
Our aircraft 500 mph
Sun travels 15 deg every hour on Equator
1760 ad. Harrison chronometer
1800 s.
Parsons Turbinia 40 mph
- Spirit of Australia 317 mp
1880 ad. 27 mn immigrants appeared in N Am
Nowadays 50k cargo ships carry on 90% of world trade
30 navigational satellites maintain GPS. Also for ships
No comments:
Post a Comment