is tomorrow, Thursday June 15
Category: astronomy
The undark nights of summer
For most of June, and into July, the Sun is so far north in the sky that it doesn’t get much below our horizon.
The sky scene, May 30 evening
The evening sky is still almost uninhabited by planets.
More devices: the Star Bottle and others
Device One was the portable flexible planisphere, which I wanted to call the Star Hat Continue reading “More devices: the Star Bottle and others”
The planet circus in May, and an explanation
This spatial view shows the planets’ paths along their orbits in the month, with sightlines to them from the Earth at May 12.
Continue reading “The planet circus in May, and an explanation”
The sky scene, May 7 evening
Eta Aquarid meteors
These fragments of Halley’s Comet come Continue reading “Eta Aquarid meteors”
The Speed of the Barycenter Settled?
I thought I should wait at least a day to let your answers Continue reading “The Speed of the Barycenter Settled?”
The Speed of the Barycenter
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”
Tri-Saros
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”