I came upon this spectacle by sheer luck, though it’s only five hundred yards from my door.
I’ve received my postal ballot, in advance of the June 8 British election. As with so many elections, it demonstrates, glaringly, Continue reading “Yet again the need for Approval Voting”
Some comments that readers made a while ago have become “unapproved,” Continue reading “Lost comments”
Device One was the portable flexible planisphere, which I wanted to call the Star Hat Continue reading “More devices: the Star Bottle and others”
This spatial view shows the planets’ paths along their orbits in the month, with sightlines to them from the Earth at May 12.
These fragments of Halley’s Comet come Continue reading “Eta Aquarid meteors”
I thought I should wait at least a day to let your answers Continue reading “The Speed of the Barycenter Settled?”
Here is a puzzle to amuse you. It’s a smallish question on which you might like to test your math. Continue reading “The Speed of the Barycenter”
The saros, the famous rhythm of similar eclipses a little over 18 years apart, is a fascinating subject with almost endless ramifications, explored Continue reading “Tri-Saros”