Caption: The speciation of vertebrates in the later part of Devonian period (420--360 Myr BP). Shown are the descendants of pelagic lobe-finned fish including early tetrapods and other lobe-finned fish (see also Wikipedia: Evolutionary history of life: Colonization of land).
Features:
This idea has led to an anthropic principle argument to explain the great coincidence: the near equality of angular diameters of the Sun and Moon. See the file sun_moon_angular.html for an discussion of the great coincidence.
In brief, Steven A. Balbus's (1953--) argument is that great coincidence is a consequence of the need for large tidal variations in the Devonian period (420--360 Myr BP). The large variations were needed to strongly favor the evolution at that time of tetrapods: i.e., four-limbed vertebrates and their descendants including humans with sufficiently advanced astronomy to notice great coincidence.
Thus, the fact that we tetrapods are here now explains in a sense great coincidence.
For more on the anthropic principle, see IAL 0: A Philosophical and Historical Introduction to Astronomy: The Anthropic Principle.