I used the following site for the equation mentioned.
http://www.geocities.jp/nyjp07/Egg/index_egg_E.html
I used equation 9b and substituted b = 0.7a into it.
There is a nice equation made by Nobuo Yamamoto which describes the curve of an egg and it is:
(x^2 + y^2)^2 = ax^3 + (3/10)xy^2, where a is the length of the major axis of the egg.
Solve this equation for y, we get:
y=+/- sqrt((3/20)ax - x^2 + xsqrt((7/10)ax + (9/400)a^2))
When I rotate the...