E.g. I always heard that you should avoid sitting in the sun between 11 and 15 pm. But any time other than that is okay.
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The intensity of the sun varies with the relative position of the sun to the earth.
If you can visualize your shadow on the ground the longer the shadow is the lower the angle of the sun and the less intense your sun exposure is.
Here is a link to an illustration that explains the concept by region of the earth
https://s3.amazonaws.com/ai2-vision-textbook-dataset/dataset_releases/rc2/train/question_images/earth_day_night_2572.png
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