In a way I didn't notice the role of the International dateline in terms of timekeeping as one day elapses into the next or one rotation follows the last one.

This is the link to the calendar cycle as the continuous flow of days and rotations are sown up within the 1461/4 structure representing a close approximation to 365 1/4 rotations per orbital circuit.

Something else to admire in how two different masterpieces fit together.