Chichén Itzá Solar Illumination

Chichén Itzá northwest-side illumination

Gregorian date Jaab date Count of days from December 21: 90 · 21 March

7 observed illuminated triangles Marked triangular illumination Direct stated range

West face: direct sun · North face: no direct sun · West-side balustrade illuminated

Radiance 6.0a ray trace · CIE clear sky · no weather file

Month

Jaab words were extracted from PDF pages 3-367. “Pop” follows the requested spelling; isolated source typos are sequence-normalized. February 12 begins with one illuminated projection at the top of the balustrade; each subsequent projection is added immediately below it. May 24 is the full-sun threshold paired with July 19. Raw 35-minute Radiance results remain separate audit data.

Gregorian date	Solstice count	Jaab date	Observed triangles	Appearance	Basis	Photographic reference