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Saros 145/22: The Great American Eclipse

Next Monday, the shadow of the Moon will bring a two-minute spell of darkness as it sweeps across the United States along a path from Oregon to South Carolina. The eclipse is one of a series known as Saros 145. [TM121 or search for “thatsmaths” at].


Saros series 145 recurring every 18 years, 10 days and 8 hours.
[Image from ]

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RT60 and Acoustic Excellence

This week’s That’s Maths column (TM072) [search for “thatsmaths” at] is about architectural acoustics, and about the remarkable work of Wallace Clement Sabine.

Boston Symphony Hall. Image downloaded from website:

Boston Symphony Hall. Image downloaded from BSH.

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2014 in review

2014 annual report of for this blog.

Here’s an excerpt:

The concert hall at the Sydney Opera House holds 2,700 people. This blog was viewed about 37,000 times in 2014. If it were a concert at Sydney Opera House, it would take about 14 sold-out performances for that many people to see it.

Click here to see the complete report.

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