{"collection":"aor","html_url":"https://unchartedknowledge.5gfusion.net/browse/aor/dv/0868.htm","path":"aor/dv/0868.htm","source_url":"https://sacred-texts.com/aor/dv/0868.htm","text":"The Da Vinci Notebooks\nThe principles of astronomical perspective (868--873).Beyond the sun and us there is darkness and so the air appears blue.\n140:445 : Compare Vol. I, No. 301.","title":"Vol. II: XV. Astronomy: 868.","type":"page"}