When I consider thy heavens - When I contemplate or look upon. They are called his heavens because he made them - because he is the proprietor of them - perhaps because they are his abode.
The work of thy fingers - Which thy fingers have made. The fingers are the instruments by which we construct a piece of work - perhaps indicating skill rather than strength; and hence so used in respect to God, as it is by his skill that the heavens have been made.
The moon and the stars - Showing, as remarked above, that probably this psalm, was composed at night, or that the train of thought was suggested by the contemplation of the starry worlds. It is not improbable that the thoughts occurred to the psalmist when meditating on the signal honor which God had conferred on him, a feeble man (see the notes at Psalms 8:2), and when his thoughts were at the same time directed to the goodness of God as the heavens were contemplated in their silent grandeur.
Which thou hast ordained - Prepared, fitted up, constituted, appointed. He had fixed them in their appropriate spheres, and they now silently showed forth his glory.