This Topic in Depth explores the Web's offerings on Orbits. The first site is offered by Northwestern University and asks: What is an orbit? (1 ). The site answers questions such as What causes an orbit to happen?, What is a satellite?, What travels in an orbit?, and Are there orbits within orbits?. A great starting site for this subject, visitors should come away with a broad and clear...

The Classroom Capsules and Notes section of the Mathematical Sciences Digital Library is chock-full of compelling resources for college-level mathematics instructors. One particular gem within this trove is the Mathematics of Planet Earth 2013 Collection. This collection brings together what appeared in the print journals of the Mathematical Association of America (MAA) and includes 16 items...