How do we know that Earth is a sphere?
Indicators…
What natural indicators can you note that help tell you that Earth is at least round?
Ships sailing into the horizon, Earth’s shadow during a Lunar Eclipse, contrails, time difference around the world and photos from orbiting space crafts
Where might you see the North Star, Polaris, in the sky at these locations: the North Pole, NYC and the Equator?
[gview file=”https://www.whsad.org/wp-content/uploads/2013/09/Polaris-general.pdf”]
What do satellites need to transmit data around the world?
LINE OF SIGHT, they can’t chat with one another if the curvature of Earth gets in the way.
