Timeline for Friday the 13th poser
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 2, 2015 at 18:13 | history | edited | GentlePurpleRain | CC BY-SA 3.0 |
Improve grammar, formatting, clarity. Correct mathematical error regarding what day the leap year must start.
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| Dec 2, 2015 at 17:02 | comment | added | GentlePurpleRain | You say it should be any "normal" year that starts on a Thursday or any leap year that starts on a Wednesday, but it seems to me that the leap year must start on a Sunday in order to have a Friday the 13th in January, April and July. | |
| Dec 2, 2015 at 15:46 | comment | added | The Dark Truth | @orp My bad. Thanks for the pointer. Fixed it now. | |
| Dec 2, 2015 at 15:45 | history | edited | The Dark Truth | CC BY-SA 3.0 |
deleted 2 characters in body
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| Dec 2, 2015 at 15:25 | comment | added | orp | Actually it was May this year that had Sunday the 31st, not March | |
| Dec 2, 2015 at 13:24 | vote | accept | JMP | ||
| Dec 2, 2015 at 13:24 | comment | added | JMP | interestingly enough you can roll the years on, december means var(jan|[year+1])=1 etc..., so we get a pattern 111211121112..., except for years divisible by 400 | |
| Dec 2, 2015 at 13:06 | comment | added | The Dark Truth | @ Jon Mark Perry: The variances i state are between weekdays. First I say that the first of january has a variance of 0. Now january has 31 days so the first of february is 31 days later or in other words 4 complete weeks plus 3 days therefore having a variance of +3 weekdays. | |
| Dec 2, 2015 at 12:46 | comment | added | JMP | i can't work your variances out 1jan == 5feb, so var should be +4? | |
| Dec 2, 2015 at 12:17 | history | answered | The Dark Truth | CC BY-SA 3.0 |