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seen Nov 24 at 3:17

Jan
18
comment Finding the angle of rotation of an ellipse from its general equation and the other way around
What do $X$ and $Y$ equal?
Jan
17
comment Finding the angle of rotation of an ellipse from its general equation and the other way around
I do not really understand these transformation equations. GEdgar is right. I learned about ellipses in my trigonometry class and we only worked with ones aligned with axes.
Jan
17
comment Finding the angle of rotation of an ellipse from its general equation and the other way around
I do not know what eigenvectors are and I don't see how the matrix correlates to the description of the ellipse.
Jan
13
comment What is the explicit equation that converts Cartesian coordinates to elliptical coordinates?
Elliptic coordinates. I am using it for Euler's three-body problem.