Mid-afternoon (2-4pm) has home plate out to third base side under shade. I'm only aware of this because I was at the A's vs. Cubs game on the 1st of March.
I agree with the above comment. Right behind home plate
Your best bet is to sit behind home plate, as the sun moves you will be covered.
Anywhere from first base to home. Other half gets darker later on the day.
Third base side
Right field was in shade yesterday.
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