Light Pollution, The Bortle Scale, and Air Pollution
- CVA Website – Clear Sky Charts
- Wikipedia – Bortle Scale
- University of Colorado Boulder – The New World Atlas of Artificial Sky Brightness
Finder Scopes
- High Point Scientific – Types of Finder Scopes
- Orion Telescopes – Finder Scopes
- Company Seven – Telrad Sight
Moon Features
- NASA Science – Earth’s Moon
- Smithsonian – Interactive Moon Map
- National Geographic – Our Newest Moon Map
Naked-Eye Planets
Constellation Identification
- Constellation Guide – Summer Constellations
- In-The-Sky.org – Free Online Planetarium
- We also recommend using an app on your smart phone or tablet to assist you with seeing what is up in the sky. There are many options, including some that are free.