# Orbital mechanics 1

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

ARTICLE

ARTICLE

### Problem solving with area and circumference of circles

PRACTICE PROBLEMS
Practice interesting area and circumference problems.

ARTICLE

CHALLENGE

ARTICLE

### 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.