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Note that in this case "doomsday" refers to the doomsday algorithm. Which can do things like calculate what day of the week an arbitrary calendar date falls on. To show a little bit of this trick note that 2024 is a Leap Year. The Leap Year Day (Feb 29th) is a Thursday. Since we are talking about leap year we can without looking or calculation know that the following dates are also Thursday:

4/4/2024

6/6/2024

8/8/2024

10/10/2024

12/12/2024

If you know those days for those months you can by addition or subtraction work our what the arbitrary dates must be. For instance, if the forgoing is true I'll bet you could tell me what day of the week 4/3/2024 is.

If you want to know how this trick and other doomsday tricks are one click on one of the links below:

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# The Doomsday Algorithm - Calculating the Weekday of any given Date

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# Doomsday Leap Year and Sadie Hawkins Day

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### Prediction: Fermi Paradox Solution

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