Greek Astronomy | Putting it all Together @BobtheScienceGuy

Uploaded February 2022 | Updated September 2026, 3 weeks ago

In this video, I take a closer look at Greek Astronomy | Putting it all Together using astronomical observations, measurements, and testable predictions. Bob the Science Guy | Science You Can Test

$Four Independent Ways to Measure Earth’s Radius Earth’s radius can be checked with independent methods that rely on different observations. This video compares Eratosthenes shadow geometry, Al-Biruni’s horizon-dip method, hidden-height measurements with refraction corrections, and great-circle distances calculated with the Haversine formula, showing that the results converge on the same physical scale.$