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Analysis of Solar Year Length

# Year Annual Sign Duration (days) Cycle Gap
1 1638 Dragon 365 3 19
2 1639 Dragon 366 4 20
3 1640 Dragon 365 1 21
4 1641 Dragon 365 2 22
5 1642 Dragon 365 3 23
6 1643 Dragon 366 4 24
7 1644 Dragon 365 1 25
8 1645 Dragon 365 2 26
9 1646 Dragon 365 3 27
10 1647 Dragon 366 4 28
11 1648 Dragon 365 1 29
12 1649 Dragon 365 2 30

Summary for the period 1638 - 1649

  • 9 common years (365 days)
  • 3 leap years (366 days)

  • 4383 days in total over 12 years