Editing Talk:2682: Easy Or Hard

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:: I already edited it away from the (implied) suggestion of Great Circle distance (as a trivial understanding of 'distance between', and probably what most searches for a value would turn up). But using latitude, longitude and radius (local, +altitude if you're into the detail) from a sufficiently accurate geophysical model (at least an oblate spheroid) as spherical coordinates leads quickly to true-ish straight-line length. And probably doesn't need to be sigbificantly further adjusted by the small dimple in spacetime that the Earth puts there, or even the fringe distortions of other tide-inducing (and therefore variable) gravitational bodies.
 
:: I already edited it away from the (implied) suggestion of Great Circle distance (as a trivial understanding of 'distance between', and probably what most searches for a value would turn up). But using latitude, longitude and radius (local, +altitude if you're into the detail) from a sufficiently accurate geophysical model (at least an oblate spheroid) as spherical coordinates leads quickly to true-ish straight-line length. And probably doesn't need to be sigbificantly further adjusted by the small dimple in spacetime that the Earth puts there, or even the fringe distortions of other tide-inducing (and therefore variable) gravitational bodies.
 
:: You might even get away with a mere spherical model (and altitude is surely less significant a factor than the difference between that and the spheroid), for a given necessary accuracy level. But I thought that was too much to explain, so left it a bit vaguer. But if further edits are needed, feel free! [[Special:Contributions/172.70.85.49|172.70.85.49]] 08:27, 10 October 2022 (UTC)
 
:: You might even get away with a mere spherical model (and altitude is surely less significant a factor than the difference between that and the spheroid), for a given necessary accuracy level. But I thought that was too much to explain, so left it a bit vaguer. But if further edits are needed, feel free! [[Special:Contributions/172.70.85.49|172.70.85.49]] 08:27, 10 October 2022 (UTC)
::: An oblate spheroid is probably overkill.  The difference between the polar and equatorial radii is 20 km, about 0.3% of the radius.  Certainly, if you're down to the accuracy where you care about the elevation above sea level, this is going to be important, but otherwise it's not going to change your result much to just use a sphere with the mean radius of the Earth. [[Special:Contributions/172.70.34.213|172.70.34.213]] 20:15, 11 October 2022 (UTC)
 
  
 
I can attest to the anesthesia one... Near the beginning of Covid I had to get my foot amputated, something they obviously would knock you out for. However, it was felt that it would be risky in light of Covid so they wouldn't, instead numbing me with a needle to the spine (as I understand it, same idea as the epidural women might get while giving birth). So I was awake and feeling nothing while getting a body part cut off me (both times, I had to get cut twice due to the first cut getting infected). Just shows how delicate even an anesthesiologist's understanding is. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:03, 8 October 2022 (UTC)
 
I can attest to the anesthesia one... Near the beginning of Covid I had to get my foot amputated, something they obviously would knock you out for. However, it was felt that it would be risky in light of Covid so they wouldn't, instead numbing me with a needle to the spine (as I understand it, same idea as the epidural women might get while giving birth). So I was awake and feeling nothing while getting a body part cut off me (both times, I had to get cut twice due to the first cut getting infected). Just shows how delicate even an anesthesiologist's understanding is. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:03, 8 October 2022 (UTC)

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