Set The Date and Don't Be Late

Set The Date and Don't Be Late

Originally shared by Irina T.

"Have you ever wondered why Easter never falls on the same date each year? If so, you’re not alone – the mathematician John Wallis, one of the earliest Fellows of the Royal Society, gave two lectures on the topic to the Society at Gresham College in April and May 1680."
[...]
Wallis was a mathematician who was also skilled with ciphers.
[...]
He wrote on theology, logic and English grammar, but is best known for his mathematical works, from Arithmetica Infinitorum in 1656 (said to have influenced Isaac Newton) to the Treatise of Algebra both Historical and Practical (1685) and Institutio Logicae (1687)."

The blog links to his biography but if you prefer Wiki, here the link 
https://en.wikipedia.org/wiki/John_Wallis
According to Wiki (references are provided) :
"Another aspect of Wallis's mathematical skills was his ability to do mental calculations. He slept badly and often did mental calculations as he lay awake in his bed. One night he calculated in his head the square root of a number with 53 digits. In the morning he dictated the 27-digit square root of the number, still entirely from memory. It was a feat that was considered remarkable, and Henry Oldenburg, the Secretary of the Royal Society, sent a colleague to investigate how Wallis did it. It was considered important enough to merit discussion in the Philosophical Transactions of the Royal Society of 1685."
Wow!

More at:
The Date of Easter 
http://aa.usno.navy.mil/faq/docs/easter.php
To find the date on any year (1583 or later) go to:
http://aa.usno.navy.mil/data/docs/easter.php

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