Suppose 9 November 2021 falls on a Tuesday. What day of the week is 9 November 2026?

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Monday. Take 9 November 2021 as the known reference day, a Tuesday. The span to 9 November 2026 covers 5 one-year gaps. Each gap runs from 9 November of one year to 9 November of the next. Check which gaps pass through a 29 February. Only the gap starting in 2023 passes through February 2024, a leap year. The other 4 gaps do not pass through a leap February. So 1 of the 5 gaps carries an extra day, and 4 gaps are ordinary. Each ordinary gap contributes 1 odd day, and the leap-affected gap contributes 2. The total is 4 times 1, plus 1 times 2, which equals 4 plus 2, or 6 odd days. Divide 6 by 7. The remainder is still 6 days, since 6 is less than 7. Move 6 days forward from Tuesday. That lands on Monday, one day short of a full week. So 9 November 2026 falls on a Monday.

Suppose 9 November 2021 falls on a Tuesday. What day of the week is 9 November 2026?

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