The morning, i.e. the morning light, or the sun, which is the cause of it. Didst thou create the sun, and appoint the order and succession of day and night? Since thy days; since thou wast born. This work was not done by thee, but by me, and that long before thou wast born. To know his place; to observe the punctual time when, and the point of the heavens where, it should arise; which varies every day. Was this thy contrivance or mine?
Related Commentaries of Job 38:12
Job 38:12
12 Hast thou commanded the morning since thy days; and caused the dayspring to know his place;