Ready References
A Guide to Backyard Astronomy
Binoculars: Halfway to a Telescope
Choosing Binoculars for Astronomy
Celebrated Variable Stars
Variable Stars Explained
Coating of Surfaces: Evaporation and Sputtering
Radiometric Time Scale
Ready References A Guide to Backyard Astronomy Binoculars: Halfway to a Telescope Choosing Binoculars for Astronomy 
Celebrated Variable Stars Variable Stars Explained 
Coating of Surfaces: Evaporation and Sputtering Radiometric Time Scale