If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Orbital mechanics 1

4 articles
1 challenge
1 video
2 skills
1 talkthrough
How do planets move? An introduction to orbital mechanics and the work of Johannes Kepler.

Applying pi

ARTICLE

Circle orbit 2

CHALLENGE

Conic sections: Intro to ellipses

VIDEO 14:14 minutes
Introduction to the ellipse.

Equation of an ellipse

PRACTICE PROBLEMS
Find the center and major and minor radius of an ellipse given its equation.

INTERACT: Elliptical orbits

TALKTHROUGH
Click and drag either foci to change orbit. You can also mouseover the terms below for definitions.