Tonight and tomorrow

In case there is anyone reading who has just logged online after spending the past ten years in suspended animation: Venus will be passing in front of the sun, starting any minute now. There’s plenty of information about the transit here, including links to numerous live streams. You can also follow the event on the Astronomy Picture of the Day.

Tomorrow is the 100th anniversary of the Katmai/Novarupta eruption, probably the most violent event on earth in the 20th century. I don’t have time to write about it, but I expect there will be commemorative posts at volcano blogs such as Eruptions. Update: ~5,300 Nimitz-class aircraft carriers per hour.

Update: Open the APOD image in another window to see it at full size, 4096 pixels square.