THIS YEAR would have been 2021 ... IF DIONYSIUS EXIGUUS HADN'T GOT WRONG !!

Happy 2021!! .. we would have wished one another in these days IF the monk Dionysius Exiguus in the year (which we nowadays call) A.D. 531 had better known the middle time interval between two Jupiter-Saturn conjunctions, so to avoid a computational error of 6 years.

The Jupiter-Saturn conjunction occurred in the years 530-531
while the monk Dionysius Exiguus was doing his computations

On behalf of pope Boniface II (530-532) and while the Jupiter-Saturn conjunction of those years 530-531 (see graphics here on the left) was already happening, Dionysius tried to establish how many years before the present conjunction had occurred the Incarnatio Domini nostri Iesu Christi , i.e. the _triple_ J-S conjunction ended in the constellation of Pisces a couple of years before Herod-I's death . This is indeed the real astronomical phenomenon today said the 'star of Bethlehem'.

Knowing that the present conjunction (he was observing night after night) was the 27th following the memorable triple one in Pisces, BUT counting with 19.64 instead of 19.86 years as time interval between two successive J-S conjunctions, he estimated 531 instead of 537 years before. He said so that the old conjunction had occurred in the Rome-year 753 instead of year 747 ab Urbe condita.

That's why - having the Christian Era begun six years before - six years should be added to the current count of the years, so to have now 2021 instead of 2015 years ab Incarnatione Domini nostri Iesu Christi.

Anyway I wish a "Very Happy New Year !!" to all my readers, wherever you are - dear friends - in the about 70 countries where this blog is read.