Ready References
A Guide to Backyard Astronomy
Understanding Celestial Coordinates
Choosing Your First Telescope
Hands-On Astrophysics (HOA)
Overview of Motion Control
Optical Instruments
Laboratory Optical Work
Ready References A Guide to Backyard Astronomy Understanding Celestial Coordinates Choosing Your First Telescope Hands-On Astrophysics (HOA) 
Overview of Motion Control 
Optical Instruments Laboratory Optical Work