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Page 257
days, which is 12 complete quads, with a remainder of 731 days. Look at the separation between the leap year days between the source and target sequences. They are separated by one common year and one leap year, accounting for the (365 + 366 =) 731-day remainder. Thus, as long as this set of conditions exists between the two sequences, the dates will match on their DOWs.
Table 9.5 Cycle lengths within the Gregorian calendar.
Elapsed QuadsDay RemainderMagic Number
0 0 0
1 366 1,827
1 730 2,191
21,096 4,018
4 365 6,209
5 731 8,036
51,095 8,400
7 010,227
8 36612,054
8 73012,418
91,09614,245
11 36516,436
12 73118,263
121,09518,627
14 020,454
15 36622,281
15 73022,645
161,09624,472
18 36526,663
19 73128,490
191,09528,854
21 030,681
22 36632,508
22 73032,872
231,09634,699

 
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