Anyone can please read these two pages they are very important in the final formulation of everything as in orbit,transport,communication and thus economic status of spaceship.
I have done too many calculation and derivation and want 1 other person to do delta-v and Kepler's laws.
http://en.wikipedia.org/wiki/Delta-v
http://www-istp.gsfc.nasa.gov/stargaze/Skepl3rd.htm
Thanks
Ishan Sharma
IX-L
