Posers and Puzzles

Posers and Puzzles

  1. Joined
    21 Jul '06
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    12 Aug '06 13:13
    How many leap years have there been since the Union Jack was adopted as the national flag of Great Britain?
  2. Standard memberXanthosNZ
    Cancerous Bus Crash
    p^2.sin(phi)
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    12 Aug '06 14:05
    Taking the date of the Union Jack adoption to be 1801 (An earlier version was used to represent England + Scotland from 1606 but that isn't all of GB) we find that we have leap years from 1804 to 2004. So that would be 51 leap years. EXCEPT that 1900 was not a leap year as years divisible by 100 are not leap years unless they are divisible by 400 (1900 was not, 2100 will not, 2000 was).

    So 50.
  3. Joined
    21 Jul '06
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    12 Aug '06 15:10
    OK, you have got the idea - which was that there are only 97 leap years per 400 years, not 100.
  4. SubscriberAThousandYoung
    iViva la Hispanidad!
    tinyurl.com/y2c6j2t3
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    12 Aug '06 23:32
    Originally posted by XanthosNZ
    Taking the date of the Union Jack adoption to be 1801 (An earlier version was used to represent England + Scotland from 1606 but that isn't all of GB) we find that we have leap years from 1804 to 2004. So that would be 51 leap years. EXCEPT that 1900 was not a leap year as years divisible by 100 are not leap years unless they are divisible by 400 (1900 was not, 2100 will not, 2000 was).

    So 50.
    Why does that rule exist (re: years ending in 00)?
  5. Standard memberXanthosNZ
    Cancerous Bus Crash
    p^2.sin(phi)
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    12 Aug '06 23:50
    Originally posted by AThousandYoung
    Why does that rule exist (re: years ending in 00)?
    A year is 365.242375 days long (not 365.25 as most people think). Therefore having a leap year every four years would get us out of sync.
  6. Joined
    21 Jul '06
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    12 Aug '06 23:581 edit
    Originally posted by AThousandYoung
    Why does that rule exist (re: years ending in 00)?
    And there are three rules, not two. In the future they might have to invent a fourth.
  7. Standard membersonhouse
    Fast and Curious
    slatington, pa, usa
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    13 Aug '06 05:52
    Originally posted by ThudanBlunder
    And there are three rules, not two. In the future they might have to invent a fourth.
    Already we know about leap seconds, because the earth does not rotate at a totally steady rate, some years it slows down a bit and other years it speeds up so that will throw everything off in due time.
  8. Joined
    21 Feb '06
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    15 Aug '06 22:14
    The three rules the Gregorian Calendar uses to define leap years approximate the number of days in a years as:

    365 + 1/4 - 1/100 + 1/400
    which is equal to 365.2425

    Currently there are approximately 365.242375 days in a year, which suggests that we will be 1 day out in 8000 years time. However the number of days in a year is changing and is not predictable, so other fudge factors may be needed before then.
  9. Standard membersonhouse
    Fast and Curious
    slatington, pa, usa
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    16 Aug '06 13:01
    Originally posted by Fat Lady
    The three rules the Gregorian Calendar uses to define leap years approximate the number of days in a years as:

    365 + 1/4 - 1/100 + 1/400
    which is equal to 365.2425

    Currently there are approximately 365.242375 days in a year, which suggests that we will be 1 day out in 8000 years time. However the number of days in a year is changing and is not predictable, so other fudge factors may be needed before then.
    Somehow I don't think we will be worrying about that in 8000 years!
  10. The Tao Temple
    Joined
    08 Mar '06
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    17 Aug '06 10:39
    Originally posted by sonhouse
    ...because the earth does not rotate at a totally steady rate, .... other years it speeds up so that will throw everything off in due time
    I don't think it spins that fast! 😉
  11. Joined
    01 Aug '06
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    19 Aug '06 10:54
    You guys have no lives!!!!!
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