r/2(R+r)=about 4%o.Please note the tangent line.

所有跟帖： 

• 0.4%? -貧論員- ♀ (0 bytes) () 08/15/2011 postreply 12:07:10

• Yes.Only estimat,we don't know the time,it has relation with the -jinjing- ♀ (0 bytes) () 08/15/2011 postreply 16:33:51

• It has relation with the rotation of the Earth. -jinjing- ♀ (0 bytes) () 08/15/2011 postreply 16:50:46