Question

define of zero shadow day

Answer 1

Well, exactly! You can get rid of yourshadow for few minutes. The “Zero Shadow Day” is a phenomenon which occurs twice in a year; it takes place when the sun is at a 90- degree angle to the Earth's surface or when the sun is just overhead.

Answer 2

zero shadow day mean that the sun will be placed directly above your head resulting in no formation of shadow at that day