Night Sky Guide   Detailed instructions on the use of night sky charts, perfect for the beginner Includes 4 seasonal night sky charts (Spring, Summer, Fall, Winter), showing all major constellations, asterisms, nebula, and other objects visible...

Walter Products Equilateral Glass Prism 3.2cm - 2cm Tall   High-quality prism for experiments in diffraction, dispersion, and spectrum formation. Constructed of glass.  3.2cm - 2cm Tall