The Adjustable Cosmos

I am just in love with this animated short that imagines an early space program.

From the video description:

"In the fifteenth century, three worthies come together to tackle the Emperor's disastrous horoscope. They lift themselves to space in their medieval vessel, braving the terrors and wonders of the of the Ptolemaic universe, to reach for the stars..."

Based on a short story by Adam Browne