[jfisjftl] Superluminal shadow of the earth

At a distance of (c year)/(2 pi) ~= 10000 AU ~= 0.16 light year from the sun, earth's shadow moves at the speed of ligh

[cdxpjzus] Convex uniform polytopes

Regular polyhedra (polytopes) become boring in 5 or more dimensions.  However, things can remain interesting if we

[kjofnjdw] Squircle go

We consider a spectrum of possible go 囲碁 board shapes.  On one extreme is the traditional grid boun

[xmnrlddp] Solving simplices on general multiaxial superhyperellipsoids

The problem of solving triangles on a sphere can be generalized in several ways: Higher dimensions: Solving tetrahed

[zlpvwetn] Summer Triangle angles

Data from Hipparcos-2 via ESASky (Science Mode), epoch J1991.25.Below, "inclination" is spherical polar coordinate from