answer of the classwork

1.he designed the geographic coordinate system
2.he found the diameter of the earth
3.he invented armilla
4.7:00am
5.15:00am
6.10:00am
7.10:00am
8.Liu Panshui(China) Liu PanShui means 6 plates of water,there is much water there
  Hu Zhou(China) Hu means lakes,there are many lakes there
  Jiang men(china) Jiang men means the gate of Yangtze River.There is where Yangtze reach the sea.
  Tai pei(china) That means the north of Tai wan.
  Shang Hai(China) That means very close to the sea.
9.PHILADELPHIA
  NEW YORK CITY
  BOSTON
  CHICAGO
  carroll county
10.washington D.C
   carroll county
   Colombia
   Philippines
   Saint Lucia
11.San Francisco
   San Diego
   Saint Lucia
   San Marino
   San Carlos
12. (39° 17' 27.2" N, 76° 36' 38.7" W)
13. (0° 13' 12.6" S, 78° 30' 44.4" W)
14. (16° 50' 20.3" S, 179° 58' 21.3" W)
15. (43° 31' 51.4" S, 172° 38' 11.9" E)
16. (58° 18' 7" N, 134° 25' 11" W)
17. two location which have same degrees but opposite direction such as N-S W-E
18.(39° 54' 21.5" S, 63° 36' 31.5" W)
19.(32° 18' 6.6" S, 115° 14' 22.7" E)
20.(39° 30' 48.5" S, 103° 37' 28.6" E)