Synonyms of 'firmament'
There are no stars in the firmament.
He was a rising star in the political firmament.
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You can refer to a field of activity, especially one where there is a lot of conflict or action, as an arena of a particular kind.
He has no intention of withdrawing from the political arena.
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the highest part of the (supposedly spherical) heavens, thought in ancient times to contain the pure element of fire and by early Christians to be the abode of God and the angels
The sun is already high in the sky.
Thesaurus for firmament from the Collins English Thesaurus
The firmament is the sky or heaven.