The Calender

 The Calender:-

Under our present calendar rules, the first day of a century can never fall on a Sunday or
a Wednesday or a Friday. As I have not given the proof, I am frequently asked
the reason why. Can you try to explain the mystery in as simple a way as possible.

Orientation:-

Find out the first day of the century 1 Jan 1001 till 1 Jan 1901 from the below link and form your explanation.

https://www.dayoftheweek.org/?m=January&d=1&y=1001&go=Go

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