Tom Wujec stereographic projection, intro , wulff net , stereoplot in python Mathematics: Urresta Gentili Trig and Geo proof Make your own Uri Tuchman ( no math quick intro) Chirag Devani (explain by drawing): SAF: reference: instructables Timothy Mitchell aka Richard Wymarc: astrolabeproject , github thingiverse ESO astrolabe generator online Basingstoke makerspace 5 part intro Free library shadows pro Abd al-Rahman al-Sufi , 1000 uses or more Marshallah , De Astrolabii Compositione et Ultilitate, source of Geoffrey Chaucer muslim heritage in-the-sky and github , pyxplot Michael Robinson aip tutorial and readymade github Springer Luminareo and readymade for 25 to 45 deg N sunrise sunset calculator 渾蓋通憲圖說 明朝 李之藻 ， 簡平儀 , jendow 650 BC Nineveh star map astrolabe