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Everything you need to learn the Doomsday algorithm and calculate the weekday for any date in your head.
Where the method came from, the one idea it is built on, and why it works.
The full method, broken into five steps, with a worked example you can follow.
Anchor-day and doomsday-date mnemonics, plus the shortcuts that build speed.
A shortcut for the year step that only asks you to hold one number.
A day-by-day plan that turns the theory into fast, reliable recall.
Shortcuts, mental habits and drills for going from correct to quick.