tronomically induced quietus, a period during which the Aztecs are likely to have sought a more accurate means of assessing the political climate in their tributaries.
12. Barlow 1949a.
13. Anales de Cuauhtitlan 1975:64.
14. Berdan 1976:138; Borah and Cook 1963:4550.
15. Broda 1976:3957. Even if tribute was previously paid to Tetzcoco six times per year, the two additional months were the seventh and fourteenth, so they did not interfere with the military campaign season.
16. Hicks 1977.
17. Berdan 1980b:3839; Matrícula de tributos 1980: 11v.
18. As one indication of this lack of full support for Aztec undertakings, Diaz del Castillo (190816, 1:284 [bk. 4, chap. 78]) noted that the Aztec allies did not fight well and often warned the enemy of Aztec intentions.
19. See Hassig (1985:85126) for an extended discussion of this point.
