https://www.youtube.com/watch?v=BJfarzxCtxk Aurora borealis taken by a Fairbanks observer. I observed from there later that year. Also a rousing tune.

http://www.heavens-above.com/ satellite events and latest ground-based ephemeris calculations

http://www.stellarium.org/ Stellarium planetarium main page

https://stellafane.org/stellafane-main/tm/atm/ guide and links to making your own mirror and mounting

https://www.youtube.com/watch?v=snz7JJlSZvw&t=5s the legendary John Dobson making telescopes – don't try this at home! Other than some good material about making fast polishing laps, doing it Dobson's way takes loads of experience.

http://alpo-astronomy.org/ Assoc. Lunar and Planetary Observers

http://www.calsky.com/ sky calculations includes a graphical almanac

http://www.cleardarksky.com/csk/ Clear Dark Sky site giving likely local conditions for viewing

https://www.minorplanetcenter.net/data Data from the Minor Planet Center

https://occultations.org/ Occultation timing organization

http://darksky.org/light-pollution/ International Dark Sky Association

https://blue-marble.de/nightlights/2017 Night light viewer

https://www.planethunters.org/ Exoplanet analysis volunteer org.

https://www.aavso.org/ Amer. Assoc. Variable Star Observers

http://www.zooniverse.org citizen science project – classify galaxies and search for exoplanets

https://www.astroleague.org/ Association of astronomy clubs

http://www.spaceweather.com/ things happening close to Earth

https://www.skyandtelescope.com/ One of two major mags devoted to astronomy

http://www.astronomy.com/ The other magazine devoted to astronomy

https://www.youtube.com/watch?v=0fKBhvDjuy0 Charles and Ray Eames Powers of Ten video

https://is.gd/crabmovie2 Crab nebula (1054 CE supernova remnant) ten year span

https://en.wikipedia.org/wiki/Hertzsprung%E2%80%93Russell_diagram H-R diagram main article

https://apod.nasa.gov/apod/astropix.html Astronomy picture of the day

https://www.astrobin.com/ search on "jmfloater" for John Massey's stuff

https://www.spacetelescope.org/ look under "images" tab

http://media.skysurvey.org/interactive360/index.html Nick Risinger's photopic sky survey

Messier catalog, Caldwell catalog, New General Catalog, Herschel 400 list

Constellation books: H.A. Rey, The Stars; Chet Raymo, 365 Starry Nights

Overall astronomy books: Ian Ridpath , Norton's 2000.0 Star Atlas. Dickinson & Dyer, Backyard Astronomer's Guide.