it isn't an hypothesis - it is a known set of facts.
any roughly spherical body eliptically orbiting a sun and revolving on an axis significantly other than paralell to the plane of the ecliptic, having an atmosphere and large bodies of water-based liquid, shall undergo the following:
1. diurnal cycle (day and night, the most obvious periodic cycle of radiation modulation)
2. cyclical aphelion and perihelion (farthest and closest to sun - yet more variation on the radiation levels on a cyclical basis)
3. coriolis effects in air motion and water-body current convection
(4. if the axis is neither perpendicular nor paralell to the ecliptic, the satellite shall also experience seasons)
((5. given the appropriate ambient temperature range, the satellite shall also experience localized incidence of evaporation, convection, condensation, and precipitation - rain, weather)
period. paragraph. RadioAstronomer and'or Dawsonville_Doc can easily confirm these details, and provide you with significant heaps of corroborative data.
these are forms of "order" or pattern imposed on the disorder-full "partial system"
I did not speculate on the effects this might have had on pre-living organic chemicals: radiation effects and complex chemistry are beyond my knowledge base. Had I done so, those speculations would have formed one or more hypotheses. Being largely ignorant of radiation-driven chemistry, I chose to keep silent on the topic.
I do know that radiant energy has significant effects on broad ranges of chemicals. RightWhale may well have input on that topic.
One of the biggies for the maintenance and upbringing of life on earth is the moon. It's one of those inspirations you get sometimes. The moon causes regular tides, which in turn give a slightly fluctuating rhythmic environment on the seashore that favors the cycles of living creatures and promotes their adaptation in easy steps. The moon also stabilizes the rotation of the earth, which would otherwise flip its polar axis at frequent intervals. Of course, the moon is tiring and gradually withdrawing, so the little littoral creatures may be headed for trouble eventually.