From the Ashes of Angels
In general, science and technology is about where we all expect it to be for generic D&D 4E. There is nothing particularly added to or removed from the equipment generally available in standard sourcebooks. Some random specific clarifications are described on this page.
Navigation is not sufficiently advanced for sea travel beyond sight of land without the aid of magic. This means travel beyond the horizon is not unheard of, but is out of reach for the average sea captain/merchant.
Alorea has correctly determined that the planet orbits the sun, and the moons orbit the planet. It has not accurately distinguished any other heavenly bodies. The correlation of the (larger) moon’s orbit to the tides is understood, but the underlying science is not understood.
Firearms and cannon do not exist.