'Fixed' in the Bible

Thus says the Lord,Who gives the sun for light by dayAnd the fixed order of the moon and of the stars for light by night,Who stirs up the sea’s roaring billows or stills the waves when they roar;The Lord of hosts is His name:

“If this fixed order departsFrom before Me,” says the Lord,“Then the descendants of Israel also will ceaseFrom being a nation before Me forever.”