Blog posts written for the BSHM appear below.

Re-Reading the Torah, 5783! Another Calendrics Blog Post

First Posted Monday, November 21, 2022 / Yom sheni, 27 Cheshvan, 5783.
David Orenstein, Emeritus, Danforth CTI, 
Toronto, Ontario, Canada

            On a Sunday evening, about a month ago, (October 16, 2022 / Yom sheni, 22 Tishrei, 5783), I went to synagogue in-person (but masked) to join our observance of Shemeni Atzeret and the celebration of Simchat Torah.

Summer Surmises: Celtic Counting

Dydd Llun, y cynta Awst / Emancipation Day, Monday, August 1, 2022 / Yom Sheni, 4 Av, 5782.

David Orenstein, Toronto, Canada

Today is Emancipation Day, commemorating the abolition of slavery throughout the British Empire in 1834 on August 1 that year. It’s a day that has been celebrated here in Ontario for well over a hundred years and is on its way to official Canada-wide recognition.

Cédric Villani, Fields Medalist 2010, Misses Re-election By a Hair

/ Yom sheni, 21 Sivan, 5782 

by David Orenstein, Toronto, Ontario, Canada.

According to this morning’s online Le Monde, consulted at 7:00 am EDT = 12:00 Noon BST, 2010 Fields Medallist, Cédric Villani, lost his bid for re-election, as the candidate of the left-wing collation La Nouvelle Union populaire écologique et sociale (NUPES), by a hair. 

Cédric Villani, Fields Medalist 2010, On Way to Re-election in France

/ Yom revi’i, 16 Sivan, 5782 

by David Orenstein, Toronto, Ontario, Canada.

Previously I was posting and sharing announcements about the forthcoming, virtual, Canadian Society for History and Philosophy of Mathematics (CSHPM), 2022 Annual Conference (May 13–15, 2022), at the umbrella CFHSS Congress (May 12-20, 2022).

Happy Easter & Happy Passover!

Good Friday, April 15, 2022 / Erev Pesach, Yom Shishi, 14 Nisan, 5782.

By happy coincidence, this day is important for both Easter and Passover: Good Friday today, and the first Passover Seder tonight, after sundown.

But how do we know when it’s Easter or when it’s Passover? 

Since this blog post is being hosted by the British Society for the History of Mathematics website, let’s hear what a historic British authority on Christian Calendrics had to say: