Ready References
A Guide to Backyard Astronomy
Time and the Amateur Astronomer
Latitude is Everything
Activity: Estimating Magnitudes
Activity: Observing Delta Cephei
Vacuum Thermopiles and the Measurement of Radiant Energy
Easy Prototyping
Ready References A Guide to Backyard Astronomy 
Time and the Amateur Astronomer Latitude is Everything 
Activity: Estimating Magnitudes Activity: Observing Delta Cephei 
Vacuum Thermopiles and the Measurement of Radiant Energy Easy Prototyping