In addition to books that pour in, and a few magazines, I get the monthly newsletter from the Fabbrica di San Pietro.   They always have fascinating short articles with photos about aspects of the Basilica of St. Peter and the grounds of the Vatican.   This week I received the issues from last August and September.  They can be a little late.
In this newsletter, something caught my eye.

See the guy with the glasses?  He is on the bas relief of the tomb of Gregory XIII who reformed the calendar.  His tomb shows the moment when Christopher Clavius gave the project to the

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