In Northern Hemisphere autumn (Southern Hemisphere spring), you can see some constellations representing a "celestial ocean in the sky" to early stargazers.
Microscopium the Microscope is a constellation with very dim stars. It holds a star, AU Microscopii, that has a disk of dust that is probably forming planets.
Equuleus the Little Horse is a diminutive constellation that lies south of the Summer Triangle. September nights are a great time to view the Little Horse.
Aquila the Eagle is home to the bright star Altair, which forms one corner in the Summer Triangle. Look for it on northern late summer or early fall evenings.