Flat Earth Math | What are umbra and penumbra? (Flat Earth + Globe Earth) @FlatEarthMath | Uploaded August 2017 | Updated October 2024, 1 hour ago.
We'll take a tour of the various parts of the Umbra+Penumbra diagram for a total solar eclipse, and show what it will look like from the perspective of someone on the ground. You'll learn how to make your own diagram in Geogebra. Plus we'll answer some "Flat Earth Debate" questions such as why aren't the lines parallel, and whether the shadow will move west to east or not.

Links mentioned:
ShadowAndSubstance.com (by Larry Koehn) Great Eclipse visualizations for all 50 states, plus much more!

Scale Model Math video:
youtube.com/watch?v=WPS9sy6XL3A

"Scale Model Math" spreadsheet (google docs):
docs.google.com/spreadsheets/d/1rx4_rqj2LH1CssVljs9kTX12ylfAjBQEmj0TFYMSZW8/edit?usp=sharing

The "Monique's Perspective" Geogebra diagram:
geogebra.org/m/AwwSpxHF