Using the TPE Desktop Web App, Part 6: Six-Degree Shadow Circle Stephen May 25, 2020 23:30 Updated As of March 2018, the web app shows the "six-degree shadow circle" as you adjust the timeline. This short video explains: Related articles Using Photo Ephemeris Web, Part 1: Basics Using Photo Ephemeris Web, Part 2: Beyond the Basics Using TPE Desktop Web App, Part 4: Horizon Using TPE Desktop Web App, Part 3: Geodetics Using TPE Desktop Web App, Part 5: Locations Comments 2 comments Sort by Date Votes Jack DeAngelis May 09, 2018 13:07 Good explanation and GREAT web app, thanks! 1 Ron Koppel June 25, 2018 16:32 All 7 tutorials were great. Thanks. 1 Please sign in to leave a comment.