Sunny Days
by L.B. Waltz
Aztec Science Fiction Book: Sunny Days by L.B. Waltz explores a world where ritual sacrifice keeps the sun moving — and failure means the end of everything.
Blurb
The Aztecs believed that the sun could not move without sacrifice. To that end, a ritual called Xiuhmolpilli would be held every 52 years. If this ceremony failed, entities known as Tzitzimimeh would destroy the world; if it succeeded, human life would continue.
But the sun would require more blood.