How to estimate Solar energy on certain direction pointed surface?

Question by Marisela Kownacki: How to estimate Solar energy on specific direction pointed surface?
If I mount a flat surface which points to certain constant direction. At certain place of the world. I now require to estimate the maximum amount of Solar radiation energy which this surface can get in the course of particular time.
Is there a PC program or an algorithm that can make this estimate for me?


Finest answer:
Answer by N - Lothringer BurWhat you want is known as a "solar declination"

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