Ready References
A Guide to Backyard Astronomy
Understanding Celestial Coordinates
Using a Map at the Telescope
Using the Hands-On Astrophysics Manual
Control Instrument Applications
The Use of Fused Silica
Ready References A Guide to Backyard Astronomy Understanding Celestial Coordinates 
Using a Map at the Telescope Using the Hands-On Astrophysics Manual Control Instrument Applications 
The Use of Fused Silica The Use of Fused Silica