There's still time before school (and early bedtimes) start up again — take advantage of balmy evenings to spark an interest in astronomy.
July's a busy month for skywatching. Not only are five bright planets in view, but three comets and a newly-discovered nova are also observable. And it all starts with a bang on Independence Day.
Sundials are amazingly simple yet effective devices. They range from sticks planted in the ground to precision-machined marvels costing thousands of dollars. The design shown here can be constructed in minutes from materials lying around your house, but it's surprisingly accurate.