My Calculus textbook (Calculus , James Stewart, 5th edition, p. 720) says this: "In the 16th century Galileo showed that the path of a projectile that is shot into the air at an angle to the ground is a parabola." My astronomy teacher says that this is not technically correct, and that the path of the projectile is actually a partial ellipse - a "bound orbit". Which do you believe is correct? With all due respect to Mr. Stewart, (and Galileo) my money is on my Astro prof. Thank you in advance for your response.