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The Solar Year of the Coligny Calendar a.pdf


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TABLE 5: Results of sequential use (cycle-years 1 to 5 of next cycle)
Cycleyear
1

2

3

4
5

Start of

Roman

solar Samon

Long

equivalent

Year I, Samon 1

Equos?

March 01, 131

Year II, Samon 13

Y

March 02, 132

Year III, Samon 25

March 03, 133

Year IV, Samon 7

March 04, 134

Year V, Samon 19

March 05, 135

Y

The plate perpetually follows the Roman calendar in this manner, as long as Equos
is given a 30th day only in (Gaulish) years that encompass a Roman bissextile.

Evaluation of results
In this system of use, two things are immediately evident: first, that all five
instances of Equos on the plate will periodically require a 30th day. This would
explain why all surviving ends of Equos show a 30th day: perhaps, as Rhys and
Fotheringham suggested (Rhys/Fotheringham 1911, 358), all five instances of the
month had a 30th day that was used only when needed, just as today’s ecclesiastical calendars always contain an entry for February 29 in the expectation that the
user will know when to employ it. In this context, the numeral CCCLXXXV engraved
into the centre of Year III does not preclude Equos of Year III from containing 29
days, as Orpen felt it did (Orpen 1910, 369): as MacNeill points out, the existence
of this numeral ‘does not imply that the number was invariable’(MacNeill 1926,
28 n.1).
Second, it is evident that for any start of solar Samon, in any cycle, the equivalent day of March is always given by the cycle-year. This makes finding March 1
simple:

TABLE 6: March 1 is always (cycle-year - 1) days before the start of solar Samon
Cycle-

Start of

Roman

Therefore:

2

Year II, Samon 13

March 02, 102

March 01, 102 = Year II, Samon 12

year

1

3

4

5

6
7

8

9

10

solar Samon

Year I, Samon 1

Year III, Samon 25
Year IV, Samon 7

Year V, Samon 19

Year I, Samon 1

Year II, Samon 13

Year III, Samon 25
Year IV, Samon 7

Year V, Samon 19

equivalent

March 01, 101

March 03, 103

March 04, 104
March 05, 105
March 06, 106

March 07, 107

March 08, 108

March 09, 109
March 10, 110

March 01, 101 = Year I, Samon 1

March 01, 103 = Year III, Samon 23
March 01, 104 = Year IV, Samon 4

March 01, 105 = Year V, Samon 15
March 01, 106 = Year V, ICA 26

March 01, 107 = Year II, Samon 7

March 01, 108 = Year III, Samon 18

March 01, 109 = Year III, Cantlos 28
March 01, 110 = Year V, Samon 10

These five initial days of solar Samon can always be used in this way to locate
March 1 on the plate; all that is necessary is to know the cycle-year.

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