Comments by "Beth Hentges" (@bethhentges) on "Aviation has a MEASUREMENT Problem!" video.

  1.  @danielbarreiro8228  Your description of a right angle as 100 grads is correct, and it’s an attempt to make angle measures more friendly in base ten. However, the words “decimal degrees” has a completely different meaning. Decimal degrees refers to writing the fractional part of one degree in decimal form rather than in minutes and seconds.
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  2. Or countries that use the metric system for everything except temperature, like Guatemala.
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  3.  @kenoliver8913  Yes, but 60 has lots of factors, including 3; 10 has only two proper factors, other than 1.
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  4. It crashed into Mars. Yes, along the way someone used US Customary units. IIRC, the problem was not that two different units were used; the problem was the conversion factor used did not have enough significant digits. By the time the probe reached Mars the accumulated round-off error was much bigger than the tolerance needed.
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  5. In commercial aviation now, are fractions of a degree measured in degrees, minutes, and seconds or in decimal degrees?
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  6. Most surveying historically in the USA used degrees, minutes, and seconds for angle measures, not grads.
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  7. And to use enough significant digits in any conversion so that by the time you get to Mars the accumulated round-off error is within tolerance.
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