192 THE INSCRIPTIONS AT COPAN. 
But we have just seen that the Initial Series following the above Second- 
ary Series number records the date 9.13.0.0.0, precisely the same date as 
that reached in the first of the above calculations, the one in which the 
tun coefficient is tr. In other words, 11 is the most likely. value of the 
tun coefficient here, since 11.14.11 exactly connects the Initial Series of the 
one altar (H’) with the Initial Series of the other (1’). Furthermore, if this 
is so, It is easy to understand why the sculptors permitted the displacement 
of the Initial Series introducing glyph here. They wished to show by this 
displacement that if 11.14.11 was counted forward from some earlier date, 
not recorded on Altar I’, the date reached would be the Initial Series immedi- 
ately following 11.14.11. Hence the displacement of the Initial Series intro- 
ducing glyph, so that this number, which led to its Initial Series immediately 
following, could precede it. 
Although the above readings are based upon certain restorations in the 
original, the results obtained are of such a nature as to prove practically 
their own accuracy, and the Secondary Series in a and the Initial Series in 
B-E may be accepted as deciphered above, viz: 
A-Dal.h.,Giau.h. Altar H’ 9.12. 8. 3. 9 8 Muluc 17 Mol 
A Altar I’ Ey ye | 
B-E Altar I’ 9.13. 0. o. o 8 Ahau 8 Uo 
The next count on Altar I’ is another Secondary Series in G (plate 23, e), 
consisting of 2.10.16.3.0, which is followed by the date 9 Ahau 13 Cumhu 
in Hb u.h., Hal. h. However, every attempt to connect this latter date with 
the Initial Series terminal date, either by counting backward or forward, will 
prove unsuccessful, and we must continue the inspection of our text to find 
the reason for its record. 
Immediately following 9 Ahau 13 Cumhu in 1 u. h. is the date 9 
Ahau 18 Zotz, and it will be found that if 2.10.16.3.0 is counted forward 
from 9 Ahau 13 Cumhu this latter date will be reached. But we have seen 
that this latter date has the value 9.12.10.0.0 on the sister monument, and 
therefore, in view of the other close relations between these two inscriptions 
pointed out above, it seems probable that it will have the same value here; 
and if this is so, the Initial Series value of g Ahau 13 Cumhu can be calcu- 
lated from it as follows: 
g.12.10. 0.0 g Ahau 18 Zotz 
2.10:16: 5330 
7. 1.13.15.0 9 Ahau 13 Cumhu 
This Secondary Series number, 7. ¢., 2.10.16.3.0, equals 1,001.58 solar 
years (tropical). At first sight it would appear as though this long number, 
composed of 365,820 days, was meant to represent exactly 1,000 solar years, 
but such an explanation demands that the Maya had determined the solar 
year no more closely than as containing 365.82 days, an error of more than 
one day every two years, which seems very unlikely in view of the accuracy 
of their other astronomical observations. However, such a long stretch of 
time, probably purely an abstract conception so far as their actual history 
