When building a greenhouse, we can all reckon that it should get as much light as possible (with proper heat ventilation).
BUT, let's talk about when a greenhouse must be built near shade. Consider a south-facing 8'Wx6'Lx6.5'H greenhouse that must be positioned to get shade either in the morning or evening (from east or west), due to 8' structures/trees on each side. It cannot be positioned in the middle with equal shading morning vs night.
Which is more important: morning or evening sun?
Mostly vegetables will be grown. Tomatoes, peppers, beans, squash, etc.
Yes; similar questions have been asked here, but I'm specifically referring to greenhouses because they hold heat and have other different variables.
My presumption is that evening outside air will already be warmer, so getting evening sun might be "less useful" than morning sun because the greenhouse will have lots of stored heat later in the day. Thus I'm guessing that it would be best to have the greenhouse more toward the west, so as to soak up more morning sun and sacrifice evening sun.