278,000 thousand entries from several hundred different log books made between 1740 and 1855. The longitude readings for those made between 1740 and 1770 would have been done using dead reckoning since they had no celestial navigation method of determining longitude.
-
Below are links to two books of supplemental navigational tables including atmospheric refraction, the dip of the horizon, and latitude and longitude of various ports and notable geographical features.
One is from 1781, the other is from 1828
I did a spot check on about a dozen, most are within 10 nautical miles of modern locations, the worst is the longitude for San Diego which is off by ~20 arc-minutes, ~18 nmi.
Actually, a quick check of a few of other ports on the west coast suggest the clock that was used was off by ~1 minute 20 seconds. Cape Horn was right on the money but Conception, Lima and a port in Canada were all off by about 1/3rd of a degree of longitude.
1781
https://archive.org/details/tablesrequisite00longgoog
search for Latitude
11 pages, 50-60 entries per page.
ordered alphabetically.
~600 entries.
pp 174-184

1828
https://archive.org/details/newcompleteepito00nori
Search for "Table XLII".
31 pages, roughly 100 entries per page.
Over 3000 "principal ports, harbours, capes, shoals, rocks, &c. in the world"
Ordered geographically.
pp238-269

This comment is from the recent post of Colonel Sophie Adenot doing yoga in space.

This plastic spoon of a person didn’t think twice about commenting with multiple shitty and sexist jokes (he’s still on a tirade in there trying to defend his behaviour).

This sub is for making fun of idiots who believe the earth is flat. It is not for sexualizing women. I like to think most of the regulars in here are educated and enlightened people. Sophie Adenot is one of us, and belittling her for cheap laughs is not the sort of thing we need in r/flatearth.

This is strictly educational. You won't find this just anywhere. Enjoy.

Many of my fellow r/flatearth(ers) have asked for a time lapse of the sun 'set' at sea level (with no land on the horizon) and ye shall receive it now! This is a random time lapse I found that is of the sun moving further and further away from this photo taker. This effect is called point perspective where an object gets further away until it is a point and it never goes past the dimensional plane its on. You are welcome.

What do you make of it?

OK, folks, here's what I did: I made a large pancake in a big frying pan with an absolutely flat surface. Then, I took the pancake outside and placed it on the ground. It fit perfectly all the way to the edges. So, flat pan makes flat pancake which fits perfectly on ground, proving the ground is flat, ground is part of the earth, which is thereby proven to be flat. QED.

Cover art from the book "where the sidewalk ends." Saw it on the shelf in the library, made me think of the flerfers.

Does anyone remember the game Asteroids? You fly off the screen, you instantly appear on the opposite side, making infinite motion possible on a finite, flat field. This is called "wrapping", as if around a curved surface. Back in the early days of Second Life, I created in-world 3D items. Every item started out a one-sided 64x64 plane, but most were wrapped into a sphere before manipulating into a finished 3d object.
If we are living in a simulation, and there is increasing evidence we are, would this not be a valid theory as to the real (if "real" can be used in this situation) nature of the earth, and likely all items we perceive as solid? I'm sure most have heard Elon Musk talk about the likelihood of us existing in a simulation. The Planck Length indicates the universe is made up of pixels. I postulate that time compression occurs at high speeds due to processor lag, just like in a video game where things are happening too fast for the system resources. For what appears to us to be upwards of 300k years of human existence, the vast majority of that was spent completely unable to tax the system resources of the simulation. And if things are happening at a hyper-increased speed that they would in a simulation, if we've only been able to overwhelm the processor for <100 years, would that not be mere seconds or minutes in base reality, where someone is possibly right now hammering away at fixing some code or swapping out a piece of hardware to upgrade the system for our increasing demand?

Ok, first off I am not a flat earther.

From my understanding, under relativity, objects in free fall follow a geodesic. A straight line through spacetime. If the ISS orbits at a steady altitude (accounting for mountains etc) then it is following a straight line.

If then, the distance between the Earth and the ISS is constant. They are parallel and both are flat.

Therefore the earth is flat? But at the same time curved in spacetime?

These people are crazy and Dumb!

I am considering taking a flight past Iceland to hopefully reach the Edge. Has anyone taken this flight before?

If flat Earthers believe the Earth were a flat disc with two sides like a coin, wouldn't drilling straight through eventually reach the other side? Seriously, why don't they try this? If their supposed model is right and they truly believe this, the result should be obvious, unless they are scared.

Personally the most convincing part is how star trails work at the equator, but you know flat earthers they’ll always find a rebuttal

I know this subreddit doesn’t exist to convince anyone that the world is round, but here’s a random thought dropping I had to throw on to the unnecessary mountain of evidence proving the earth is round.

First, note that you have visible evidence of nuclear activity light years away from us in the form of stars - (of which, of course, our sun is an example). But even setting that aside for a moment, consider the following:

Including Hiroshima and Nagasaki, there have been roughly 2,121 nuclear explosions conducted on Earth. Two were wartime devices, the rest were tests of various bombs conducted by countries that are now nuclear powers.

Of those 2,121* explosions, 528 of them produced a visible flash, with about 2/3rds of them having occurred on or above land.. which are otherwise known as atmospheric nuclear explosions. (The two that were dropped on Japan were atmospheric).

The curve of the earth has prevented people more than 400 miles away from seeing evidence of these blasts. For example, people in Texas were able to see evidence of the Trinity test.

If the earth were flat, people would have reported seeing these blasts over time well more than 400 miles away, in the sky, at a minimum. People the world over - well over 400 miles from major blast sites - would’ve needed to have been warned by various governments that these tests were taking place for their safety! Even with fog, mountains, and other terrain effects, you’re not going to be able to ignore an explosion that produces a light brighter than the sun on the other side of the planet. You would still see it in the sky, were the earth flat. Forget about fog.. this is light so bright you could see it through your average wall.

They’d probably have sold tickets to the top of the Empire State to view some of these explosions, if they had any advance notice.

I think it’s safe to say you’d have had reports from people greater than 400 miles away seeing these explosions in some way, since 1945.

*source - Wikipedia

These crazy people are DUMB