User:Pete Hobbs/Doomsday Rule

Doomsday rule: tables (2013)
The section "Table of recent doomsdays" was changed recently in a Wikipedia page about Doomsday rule, the contributor intending to "neaten to make pattern more evident". The effect before/after are comparable in Tables 1 and 2 (below). Table 2 is more visually pleasing, and seems intuitively the correct thing to do if one regards the table as simply a "look-up" device. But a recurring 28-year pattern is now lost, whereas it did partly show itself in Table 1.

Table 1 was partially flawed but it can be improved in a better way, as in proposed Table 3 (below)where a 7x5 (recurring) grid is used - the 35 squares indicating the 28 day cycle perfectly.

Table 1 - Doomsdays for some contemporary years (12:38, 16 Feb 2013)
Doomsday for the current year in the Gregorian calendar (2024) is .

For some other contemporary years :

Notes: Fill in the table horizontally, skipping one column for each leap year. This table cycles every 28 years, except in the Gregorian calendar on years multiple of 100 (like 1900 which is not a leap year) that are not multiple of 400 (like 2000 which is still a leap year). The full cycle is 28 years (1,461 weeks) in the Julian calendar, 400 years (20,871 weeks) in the Gregorian calendar.

Table 2 - Doomsdays for some contemporary years (08:49, 17 Feb 2013)
Doomsday for the current year in the Gregorian calendar (2024) is .

For some other contemporary years :

Notes: Fill in the table horizontally, skipping one column for each leap year. This table cycles every 28 years, except in the Gregorian calendar on years multiple of 100 (like 1900 which is not a leap year) that are not multiple of 400 (like 2000 which is still a leap year). The full cycle is 28 years (1,461 weeks) in the Julian calendar, 400 years (20,871 weeks) in the Gregorian calendar.

Table 3 - Doomsdays for some contemporary years (proposed further change)
Doomsday for the current year in the Gregorian calendar (2024) is .

For some other contemporary years :

Notes: Fill in the table horizontally, skipping one column for each leap year. This table cycles every 28 years, except in the Gregorian calendar on years multiple of 100 (like 1900 which is not a leap year) that are not multiple of 400 (like 2000 which is still a leap year). The full cycle is 28 years (1,461 weeks) in the Julian calendar, 400 years (20,871 weeks) in the Gregorian calendar.