Eight and Alan Turing, because that’s something that happens in The Turing Test by Paul Leonhard. There’s also a rather wonderful fic by apolesen, which partly inspired this (I’ve also watched this film about Alan Turing with Derek Jacobi recently, I forget the title).
Oh. Isn’t this fabulous?
re reblogging because that fic was both beautiful and heartbreaking and you all should go read it asap.
Companion sketch #31: Edwardian adventuress Charlotte “Charley” Pollard, plus Ramsay the Vortisaur.
Charley’s costume is the same one designed by the great Cliff Robinson for the promotional art of the Big Finish story “Absolution”.
"You have the bridge, Number One. I’ll be in the holodeck."
"The holodeck, sir?"
"It appears as if I’ve been granted one extra hour in the ball pit and I do not intend on wasting a single second of it."
tumblr is currently a place for people not at comic-con to sit and wait for pictures of comic-con to be posted. then cry about how we are not at comic-con.
Magnetic putty eating a piece of metal.
No explanation needed.
Fact: Eratosthenes, a Greek philosopher, was the first person to calculate the circumference of the Earth, which he did in around 240 BCE.
Explanation: He knew that in the Egyptian city of Swenet at noon on the summer solstice, the sun shone directly down a well. He then measured the angle of sunlight in a well in Alexandria at noon on the summer solstice, and found that it was 7°12’ (seven degrees, twelve minutes) south of vertical. The recorded distance between Swenet and Alexandria was 5000 stadia (which he then fact-checked by asking how long it took to travel between the two by camel). After rounding, he got a circumference of 252,000 stadia, at 700 stadia per degree.
There are four problems with this:
- We don’t know which variation of a stadium Eratosthenes was using
- The distance between Swenet and Alexandria may or may not be 5000 stadia, but it almost certainly isn’t exactly that.
- The Earth isn’t a sphere
- He assumed that Swenet and Alexandria lay on the same meridian (they don’t)
Even with all this, the two most common calculations for Eratosthenes’ circumference are 16.3% off (using the Attic stadium of 185 meters) and 1.6% off (using the Egyptian stadium of 157.5 meters).
The Fun Bit: Modern geographers redid Eratosthenes’ work, using more accurate numbers for the angle of sunlight and the distance between the cities. Their result was 40,074 km, which is only 0.16% away from the actual value of 40,007.862917 km.