Mayans were adept at using shadows over El Castillo Mayans were adept at using shadows Equinox celebration el castillo Equinox celebration these shadows appear Temple of Kukulkán Equinox celebration Equinox celebration Equinox celebration Equinox celebration Equinox celebration Equinox celebration these shadows appear El Castillo Equinox celebration Equinox celebration Equinox celebration Equinox celebration Temple of Kukulkán Mayans were adept at using shadows Equinox celebration Chichén Itzá Equinox celebration over El Castillo Equinox celebration Equinox celebration El Castillo