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...

The North American Sundial Society (NASS) is "interested in the study, development, history, and preservation of sundials and the art of dialing throughout the continent." Users can find applets that display the daily and annual paths of the sun and moon. The NASS message board allows sundial hobbyists the chance to correspond with each other. The website provides an extensive list of the sundials...