| 10. | 0. | 0. | 0. | 0 | 7 Ahau 18 Zip |
| 1. | 0. | 0. | 0 | ||
| 10. | 1. | 0. | 0. | 0 | 5 Ahau 3 Kayab |
| End of Katun 1. | |||||
This latter date is found also on Stelæ 8, 9, and 10, at the same city.
Another Cycle-10 ending date which was probably "prophetic", like the one on Zoömorph G at Quirigua, is figured on Altar S at Copan (see fig. [81]). In the first glyph on the left appears an Initial-series introducing glyph; this is followed in glyphs 1-3 by the Initial-series number 9.15.0.0.0, which the student will find leads to the terminal date 4 Ahau 13 Yax recorded in glyph 4. This whole Initial Series reads, therefore, 9.15.0.0.0 4 Ahau 13 Yax. In glyph 6a is recorded 5 katuns and in glyph 7 the date 7 Ahau 18 Zip, in other words, a Secondary Series.[[221]] Reducing the number in glyph 6a to units of the first order, we have:
| 6a = | 5 × | 7,200 = | 36,000 | |
 | 0 × | 360 = | 0 | |
| Not recorded | 0 × | 20 = | 0 | |
| 0 × | 1 = | 0 | ||
| ——— | ||||
| 36,000 | ||||
Fig. 81. The Initial Series, Secondary Series, and Period-ending date on Altar S, Copan.
Counting this number forward from the date 4 Ahau 13 Yax, the terminal date reached will be found to agree with the date recorded in glyph 7, 7 Ahau 18 Zip. But turning to our text again, we find that this date is declared by glyph 8a to be at the end of Cycle 10. Compare the ending sign, which appears as the superfix in glyph 8a, with figure [37], a-h. Therefore the Secondary-series date 7 Ahau 18 Zip, there recorded, closed Cycle 10. The same fact could have been determined by adding the Secondary-series number in glyph 6a to the Initial-series number of the starting point 4 Ahau 13 Yax in glyphs 1-3:
| 9. | 15. | 0. | 0. | 0] | 4 Ahau 13 Yax |
| 5. | (0. | 0. | 0) | ||
| 10. | 0. | 0. | 0. | 0] | 7 Ahau 18 Zip |