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Earth's Radius Follow-Up 1

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First published at 15:00 UTC on September 23rd, 2019.

#geodesy
#surveying
#flatearth

TheMaineSurveyor

The Maine Surveyor

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I returned to Portland Head on May 16th and May 22nd 2019 to carry out the Al-Biruni Method of calculating Earth's radius.

This is a follow-up to my video "Calculating Earth's Radius from Horizon Drop - Geodesy" https://youtu.…

I returned to Portland Head on May 16th and May 22nd 2019 to carry out the Al-Biruni Method of calculating Earth's radius.

This is a follow-up to my video "Calculating Earth's Radius from Horizon Drop - Geodesy" https://youtu.be/dfD-rX6dmMQ

The method still works. Further study of refraction is necessary. I had two very different humidity percentages on these two trips. As a result, I had two very different radius results. It would be great to be able to figure out how to mathematically describe these relationships from my own work. Even if I can't work it out on my own, I'm having a lot of fun in the process!

Helpful Links:
Roohif's video on refraction:
"7/6r is an UNDER-ESTIMATE"
https://youtu.be/NuPzYBrxqdM

National Geodetic Survey Datasheets:
https://www.ngs.noaa.gov/NGSDataExplorer/

NOAA Navigation charts:
https://www.charts.noaa.gov/InteractiveCatalog/nrnc.shtml

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