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Use the table to find the day of the week
Examples:
 * December 26, 1893 (GD)

Dec (row) + 26 (column) = Wed → 93 mod 28 = 9 (row) Wed (column) + 18 (row) = Tue sday.
 * January 1, 2000 (GD)

Jan (row) + 1 (column) = Sun → 0 (row) Sun (column) + 20 (row) = Sat urday.
 * January 8, 1900 (GD)

Jan (row) + 8 (column) = Mon → 0 (row) Mon (column) + 19 (row) = Mon day.

Algorithm: $$D = (d + m - y + c)$$ $$mod$$ $$7$$
 * December 26, 1893 (GD)

$$D = (5 + 5 - 3 + 2)$$ $$mod$$ $$7 = 9$$ $$mod$$ $$7 = 2 =$$ $$Tuesday$$.
 * January 1, 2000 (GD)

$$D = (1 + 6 - 0 + 6)$$ $$mod$$ $$7 = 13$$ $$mod$$ $$7 = 6 =$$ $$Saturday$$.
 * January 8, 1900 (GD)

$$D = (1 + 0 - 0 + 0)$$ $$mod$$ $$7 = 1 =$$ $$Monday$$. -->