nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqknzsux7p6lzwzdedp3m8c3c92z0swzc0xyy5glvse58txj5e9ztqaufa4k (nprofile…fa4k)
Did you know that people at the Scott-Amundsen South Pole Station have their own local ad-hoc'ish coordinate system for telling someone how to get from one building, telescope, or installation to another one? It's largely just a square'ish grid covering the whole area because things like "West" and "North" get a little squishy the closer you get to the pole itself. They're perfectly well-defined (outside of the pole itself) but trying to communicate the relationships between locations with them is headache-inducing and there's really no good reason why local navigation cannot just follow a grid that has been patched over the the usual lon/lat grid that just doesn't work very well at the south pole proper.
I am reminded of this every time I see people writing about black holes in (r,t) coordinates. Not that they're not perfectly well-defined (outside of the singularity itself) they just don't work very well to describe the relationships between events around an event horizon.
Σ(i³) = (Σi)²
npub1yw…4ly7s
2024-12-01 02:29:31 UTC
in reply to nevent1q…kxk7
Author Public Key
npub1ywtur656cktslfk5qftessjsrzf0ywh6a0xdm3pdd3849ufe3yeqy4ly7sSeen on
wss://relay.ditto.pubPublished at
2024-12-01 02:29:31 UTCEvent JSON
{
"id": "b3fbb19d9576fc56fd30da3a6ee8f6715d431b725b5c896c158b048963ef6cb4",
"pubkey": "2397c1ea9ac5970fa6d402579842501892f23afaebccddc42d6c4f52f1398932",
"created_at": 1733020171,
"kind": 1,
"tags": [
[
"p",
"b4c50e1bc1d7c4e1372d0c767c4705509f070b0f3109447d90cd0eb34a992896",
"wss://relay.mostr.pub"
],
[
"p",
"f7346eb283902ada9d21c109a93e83128d9f87d8fcfe70ad819b3bf2ad9bce16",
"wss://relay.mostr.pub"
],
[
"e",
"f7859a05f2a9467f76f7171b7f943e54ff1f1664fefbf1e609d16c9f6f66e001",
"wss://relay.mostr.pub",
"reply"
],
[
"proxy",
"https://mathstodon.xyz/users/SvenGeier/statuses/113575209976993089",
"activitypub"
]
],
"content": "nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqknzsux7p6lzwzdedp3m8c3c92z0swzc0xyy5glvse58txj5e9ztqaufa4k \nDid you know that people at the Scott-Amundsen South Pole Station have their own local ad-hoc'ish coordinate system for telling someone how to get from one building, telescope, or installation to another one? It's largely just a square'ish grid covering the whole area because things like \"West\" and \"North\" get a little squishy the closer you get to the pole itself. They're perfectly well-defined (outside of the pole itself) but trying to communicate the relationships between locations with them is headache-inducing and there's really no good reason why local navigation cannot just follow a grid that has been patched over the the usual lon/lat grid that just doesn't work very well at the south pole proper.\nI am reminded of this every time I see people writing about black holes in (r,t) coordinates. Not that they're not perfectly well-defined (outside of the singularity itself) they just don't work very well to describe the relationships between events around an event horizon.",
"sig": "6595cc73fdbbbfab3889268364582abed49e51ba8dc049a357f29ad2550a6fa9ab2d9fc082c2f2376924afd2d64763491cea3c397b3e54d61969ddd01002d713"
}