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5 votes
How the Aztecs made their astronomical calculations is the subject of my next paper.

How the Aztecs


How the Aztecs made their astronomical calculations


How the Aztecs made their astronomical calculations is


the subject of my next paper

1 Answer

5 votes
The noun clause is how the Aztecs made their astronomical calculations.
Just invert the whole sentence - The subject of my next paper is how the Aztecs made their astronomical calculations.
The whole clause is used as the direct object.