Definite article with common noun, both singular, absolute.
While ha‘aretz, 'the land' will be used elsewhere in this chapter to refer to 'the Earth,' (see, e.g., v2) here it is conjoined with 'the heavens' to form a merism to signify the entire cosmos, i.e., all that has been created.
Open BDB on ha ; 'eretz
Open Alberith Hebrew Wordbook on 'eretz
Open TWOT on 'aretz
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