General
Astro-Skeleton by Mark Frank and Buchanan of Chelmsford
http://www.my-time-machines.net/astro_index.htm
https://www.buchananclocks.com/no-6-astronomical-extraordinaire/
Staines and Son Orrery Makers
Ptolemaic Orrery
https://academic.oup.com/astrogeo/article/58/1/1.42/2938122
Celestial Timing
NASA Planetary Fact Sheet
https://nssdc.gsfc.nasa.gov/planetary/factsheet/
Gear Profiles
Involute Gear Generator: Dr. Rainer Hessmer:
http://hessmer.org/gears/InvoluteSpurGearBuilder.html
Involute Tooth Profile Calculator: Martin Chick & Associates
http://computers.martinchick.com/spur_gear.html
Gear Cutting
Gears and Gear Cutting for Home Machinists by Ivan Law:
https://www.amazon.com/gp/product/1565239172/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Tooling
Glowforge Basic
https://glowforge.com/our-products
Sherline Lathe
https://www.sherline.com/product/40004100-lathe-dro/
LittleMachineShop MiniMill
https://littlemachineshop.com/products/product_view.php?ProductID=3990
Rotary Table
https://littlemachineshop.com/products/product_view.php?ProductID=2420
Electronics
Arduino Uno
https://store.arduino.cc/products/arduino-uno-rev3/
Autodriver
https://www.sparkfun.com/products/13752
Stepper Motor
https://www.sparkfun.com/products/9238