Category Archives: sciences

Friday thirteen come on Friday this month

Posted on Saturday, 2011 May 14 by Anton

Somewhere or other I recently mentioned having heard that, because the Gregorian calendar cycle of 400 years is a multiple of 7 days, the 13th of the month is not evenly distributed and falls more often on Friday than on … Continue reading →

Posted in calendars | 2 Comments

links from spaaace

Posted on Sunday, 2011 May 08 by Anton

Average illumination near the Moon’s south pole, showing which crater floors never (or almost never) see sunlight. Unfortunately the text doesn’t quantify what the whitest pixel means, i.e., how much time the most-illuminated point spends in shadow. Wobbling time exposure … Continue reading →

Posted in astronomy | Leave a comment

Whip Conflation Now

Posted on Thursday, 2011 April 07 by Anton

Roderick Long: Corporations versus the Market; or, Whip Conflation Now. Read it.

Posted in economics | Tagged , | Leave a comment

hi Wendy

Posted on Wednesday, 2011 March 02 by Anton

My newest incoming link is from Wendy Krieger, whose site you should definitely see if you’re interested in polytopes, duodecimalism or the letter Þ.

Posted in language, mathematics | 1 Comment

i got tired of looking at grey ribbons

Posted on Monday, 2011 February 21 by Anton
Posted in eye-candy, mathematics | Leave a comment

more chainmail

Posted on Saturday, 2011 February 12 by Anton

This image, which I made a few years ago, is based on a tiling of the hyperbolic plane with triangles whose angles are π/2, π/3, π/7. Other than the 7, which can be changed to any higher integer, I couldn’t … Continue reading →

Posted in eye-candy, mathematics | 1 Comment

another thought that I’m never likely to have occasion to apply

Posted on Monday, 2011 January 31 by Anton

If one has the luxury of designing a calendar from scratch, it might be good to put leap day at aphelion, where its angular value is least.

Posted in calendars | Tagged | 1 Comment