Calendrical Confusion or The Dangers of Dating!

This morning one of the sources I consult to remind me of anniversaries of discoveries, births and deaths in the history of science had two entries concerning the father and son Friesian Renaissance astronomers David and Johannes Fabricius. According to this source David was born 9th March 1564 and Johannes made his first observation of sunspots on 9th March 1611. Oh I thought in my half-awake state what a nice birthday present for his father! Then I woke up. [………..]

About thonyc

Aging freak who fell in love with the history of science and now resides mostly in the 16th century.
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