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Thank you for the helpful suggestions guys! But I figured out that 43 + 23 degrees latitude won't do well for a roof angle. I now have newer information which is 43 +15 = 58 but "However, as long as the glazing angle is within 45 and 75 degrees you will be within 5% of optimum – therefore it often makes more sense to design the building to height restriction and material constraints vs optimal glazing angle. " So my angle can be safely made 50 or 60 degrees. So now I'm thinking about a 50 degree roof angle. What do you think? I plan to make the pit greenhouse at least 3 metres deep on the north side with a 50 degree angle.

Hello there! I want to construct a walipini design greenhouse. I've read as many information as I could but one thing that embarrassed me is the roof angle. I live in a town in Northeastern Bulgaria, 43 degrees latitude. Can you help me calculate my roof angle so that I can maintain an aquaponic system in it through winter and summer. Mind that the average temperature is roughly 11 degrees - 20-35 degrees during warm seasons and 10- -1-,-2 degrees during autumn and winter. I would really appreciate any help & suggestions because this is my first time ever trying such construction. Thank you in advance.