Shadow angle calculation for solar tracking application

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Shadow Length

Dear all,

*I am looking for relationship Between Lmin and solar radiation angle.I know Here in above link they provided relation. But i don't know how to calculate it. x- modules length=1200mm ω-modules angle is changes with time of day.*Here MY module angle will be 45 till 7AM-9:30 AM. This angle need to change because of shadow . So how to calculate new shadow angle.

MY module angle will be -45 till 3:30pm-6pm. This angle need to change because of shadow . So how to calculate new shadow angle.

between 9:30 AM and 3:30 Pm my ω-modules angle has no affect on shadowing.