What is in this image? Describe it as if you were explaining it to someone from the 15th century.

Imagine a wondrous chariot, unlike any you''ve seen pulled by horses. This creation, borne of future minds, sails not upon the seas nor rides the roads, but soars through the skies much like a bird in flight. It is crafted of materials unknown to your time, smooth and shaped to slip through the air with ease. Its body is round and bulbous with two large protrusions on either side, mimicking perhaps, the fins of a fish. Upon its top sits a great circle, flat and disc-like, used for steering its course through the heavens. This fantastic vessel, a marvel of far-off times, is designed to traverse the boundless skies, exploring beyond the highest clouds.