Cherry darkens for the same reason as maple darkens...high iron content in the wood fibers. It has nothing to do with sunlight
I am all for learning what I don't know and accepting something different that what I thought I knew. I have had several years in the hardwood veneer slicing industry (machinery design and machinery building), so I have been around several conversations about woods. I am familiar with wood quality due to where it grew such as in the north vs the south and if it grew in a moist area vs dry that can change the density, sap, heart, pith and such. I have read several articles about wood finishing. Several reputable publications claim UV and oxygen are the catalysts that causes the darkening.
Popular Woodworking Magazine
And the reference that I have posted b4
Please share some reading material that says UV has nothing to do with making Cherry dark and that heat is what makes it dark.