Welcome To Day 733691 (AD)



Don't ask why, but for some reason I was curious and wanted to know how many days have passed since January 1, Year 1 (AD).

The easiest way to figure it out was to find today's Julian Date, the Julian Date of January 1, 1 and then subtract "Day 1" from today (and then add 1, of course).

For those that don't know: the Julian Date is the number of days since January 1, 4713 BC.

Today's Julian Date is 2455113.5, and January 1, 1's is 1721423.5. Do the subtraction (2455113.5 – 1721423.5) and you get 733690 days since Day 1. Add 1 (to include Day 1 in the number) and you end up with today being Day 733691.

The Navy has a nifty form where you can enter a date and get the Julian Date over at http://aa.usno.navy.mil/data/docs/JulianDate.php

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5 Comments »

  1. sparx (882 comments) said,

    Also, my birthday was on Day 723997.
    I'm 9694 days old.

    October 9, 2009 @ 10:58 am


  2. Cactus (10 comments) said,

    Interesting. It seems like it should be longer.

    I get 733677 when I do a crude (2009X365) + 502 – 110.

    The 502 being the extra days for leap years and the 110 being the remaining days in 2009.

    Discrepancy of 2 weeks. I wonder what this is from…

    I'd like to see a post about Ipecac…like, who discovered it…

    "Hey, I think I'll drink this stuff that tastes like tree sap and see what happens."

    October 10, 2009 @ 9:20 am


  3. sparx (882 comments) said,

    110? I get about 83 days left in the year.
    (2009*365) + (502 – 83) = 733704, which is still 13 days off.

    Part of the discrepancy is the "502". Leap years do not occur on years divisible by 100, unless they are divisible by 400. A rough figure for that would be (2009 / 4) – (2009 / 100) + (2009 / 400)… which equals 487.

    Redoing the math, you get 733689, and that is only 2 days off. My "83" days left might be a day off, and the leap year calculation of 487 could be a few days off still, but not nearly the margin of error you came up with.

    October 10, 2009 @ 9:44 am


  4. spudart (890 comments) said,

    all this math is making my head explode. Y'all need to use http://www.timeanddate.com

    October 12, 2009 @ 4:05 pm


  5. unlikelymoose (375 comments) said,

    Today is Tuesday. I know that.

    October 13, 2009 @ 8:07 am


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