Firmaments

The night sky was so clear that you could see the firmaments above.

The film takes place in the firmaments of the Wild West.

The astrophysicist studied the composition of the firmaments.

The astronomer used the firmaments to locate the position of the star.

Students learned how to use the firmaments to locate planets in their astronomy class.

The clouds drifted lazily across the firmaments.

He studied the firmaments to determine the best time to observe the constellation.