A275477 Decimal expansion of arccos(2/Pi).

8, 8, 0, 6, 8, 9, 2, 3, 5, 4, 2, 0, 3, 5, 6, 6, 6, 7, 2, 2, 6, 9, 4, 3, 7, 8, 2, 5, 6, 8, 9, 0, 0, 7, 2, 2, 0, 2, 8, 7, 5, 1, 5, 9, 9, 9, 8, 7, 5, 0, 1, 8, 2, 3, 4, 4, 9, 0, 0, 6, 6, 8, 2, 1, 6, 9, 0, 8, 8, 0, 0, 7, 5, 9, 2, 6, 4, 1, 0, 9, 0, 4, 0, 6, 9, 6, 4, 5, 3, 5, 0, 8, 5, 8, 6, 6, 0, 2, 9, 5, 0, 2

Offset: 0

Author

Jeremy Tan, Jul 29 2016

Keywords

• nonn
• cons

Comments

The Winkel tripel projection is the average of the Aitoff projection and an equirectangular projection. The latter component depends on a standard parallel which in radians is this constant.

Examples

			0.88068923542035666722694378256890...
		

Links

• Mike Bostock, Winkel Tripel
• Wikipedia, Winkel tripel projection

Crossrefs

Cf. A060294 (2/Pi), A232247 (arctan(2/Pi)).

Programs

Mathematica

First@ RealDigits@ N[ArcCos[2/Pi], 120] (* Michael De Vlieger, Aug 06 2016 *)

PARI

acos(2/Pi)