Solar observatory on Mount Tlaloc, Mexico. The inclined causeway aligns with the rising sun on February 23–24, in coincidence with the Mexica calendar’s new year.

Solar observatory on Mount Tlaloc, Mexico. The inclined causeway aligns with the rising sun on February 23–24, in coincidence with the Mexica calendar's new year.

Solar observatory on Mount Tlaloc, Mexico. The inclined causeway aligns with the rising sun on February 23–24, in coincidence with the Mexica calendar’s new year.