An international day, and then the longest day?

Sunday June 27 will be the day that seems longest.  That is, sunset will be latest (for latitude 40° north).

Why does latest sunset Continue reading “An international day, and then the longest day?”

Shadow over the north pole and the free city

On Thursday, June 10, the Sun will appear as a burning ring around the darkened Moon.

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The Sirius-Canopus Hour and Yemen

We contemplated the Coma Hour and the limiting latitude for seeing the Southern Cross.  The other lantern that can lurk at the southern horizon is Canopus, second brightest of stars. Continue reading “The Sirius-Canopus Hour and Yemen”

RBG and RGB

Acronyms trip us up.  AI: you think you’re about to learn something about Artificial Intelligence, but it’s Amnesty International.  RGB is one I have to worry about, when making colored illustrations – should I be using Red-Green-Blue mode, or Cyan-Magenta-Yellow-Black, CMYK?

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