Theaters in Shakespeare's day were open , and the spectators who stood in the yard to watch a performance were exposed to the Sunlight
Step-by-step explanation:
The theaters in the time of Renaissance were many and the business itself was one of the most buzzing and developing ones but they were usually not run in the night.
It was in the day that most plays would be performed under natural sunlight, which is completely different from the theater of modern times.
So the audience standing in the yard would often sit under direct sunlight to be able to watch the play from the open air theater like a stadium.