please empty your brain below
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Challenge time:
I was born on Easter Sunday. I will be 73 when my birthday next falls on an Easter Sunday.
I *think* that should be enough information for somebody to work out a) when my birthday is and b) how old I currently am.
An imaginary pint for whoever can work it out!
RG | 12.04.20 - 7:33 a.m. | #
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Your birthday is today.
You are 0 years old.
Jochem | 12.04.20 - 8:10 a.m. | #
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Assuming the main religious groups don't finally agree on a fixed date for Easter.
Still Anon | 12.04.20 - 8:34 a.m. | #
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Over the next ten years (2021-2030) we'll have ten different Easter Days.
But during the ten years after that (2031-2040) we only get three new ones, plus seven repeats from the 2020s.
Between now and 2050, only half of the possible dates for Easter Day actually occur.
diamond geezer | Homepage | 12.04.20 - 8:53 a.m. | #
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What a fascinating data set. Your follow up comment here adds even more mystery. For example, how common is it for there to be 10 different dates, and what is the longest run of different dates possible, historically or in the future?
Also, we have a new pot of mini daffodils, as well as a bunch of bluebells picked from the garden to adorn our home today.
Ken | 12.04.20 - 9:06 a.m. | #
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The longest possible sequence of different Easter dates is 11 years, as we're currently experiencing (2020-2030).
Easter often repeats after 11 years, e.g.
• 31st March: 1991, 2002, 2013, 2024
• 5th April: 2015, 2026, 2037, 2048
• 16th April: 1995, 2006, 2017, 2028
• 21st April: 2019, 2030, 2041, 2052
...which prevents the sequence being longer.
Easter can repeat three times in 11 years, e.g.
• 3rd April: 1983, 1988, 1994
• 18th April: 2049, 2055, 2060
• 19th April: 2071, 2076, 2082
...but there are no such repeats at present.
diamond geezer | Homepage | 12.04.20 - 9:41 a.m. | #
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Happy Easter!
About half the Easter dates repeat after 11 years, so it is tricky to find a run of unique dates much longer than that. See here. Some useful tables and graphs on that website.
Andrew | 12.04.20 - 9:48 a.m. | #
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I don't know the answer to RG's challenge, but Jochem's response has just made me laugh out loud. Thank you!
Man of Kent | 12.04.20 - 10:46 a.m. | #
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It was my son's birthday yesterday and he was wondering if it had ever fallen on Easter Day (I thought it had when he was about 7 or 8) and when would it do so again. I can now tell him - when he is 65!! Yikes!
Cornish Cockney | 12.04.20 - 10:56 a.m. | #
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During the 21st century, Easter falls on the same date 11 years later half of the time.
(it's actually 49 times out of 100)
But this never happens if it's a leap year.
diamond geezer | Homepage | 12.04.20 - 11:00 a.m. | #
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I was born on Easter Day and, if memory serves correctly, my 11th and 22nd birthdays are on Easter Day. I thought this was great because it was an excuse for extra chocolate eggs. Sadly, it looks like it won't be happening again until I'm in my eighties - if I make it that far.
James | 12.04.20 - 11:27 a.m. | #
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Jochem - I hadn't noticed that!
RG | 12.04.20 - 1:34 p.m. | #
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Can anyone explain why the early dates are so rare?
dg writes: Yes.
Caew | 12.04.20 - 2:59 p.m. | #
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Thanks for the updates and hope that you made the most of your interactive day. Happy Easter!
Ken | 12.04.20 - 11:40 p.m. | #
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