How do you know the difference between illusion and realty?

Illusion is the art of making it look and seem but in truth it is a full out lie. So how do you tell? People who have high education are looked at as gods. But in the end they are only human, and it is human nature to lie, cheat, and protect your way of servival (one being your source of income/job) 1. Example is NASA and the earth, they say it is a globe, how do we know? When the moon that is said to be on the other side of the earth from the sun, is up in the sky when the sun is still up. The stars do not move so there is no real evidence that the earth turns, only the sun rising. But if the earth is as they say, the moon will rise and fall just like the sun, and the stars will move in the same way (but that is not the case).

We think and believe they go to space, but I know a boy that they could of copied. The boy got in trouble a few times, and each time he said "sorry, ok I will go to my room" after he closed the door, he changed outfits and gos out the window being careful not to be seen by anyone in the house and gos to his friends to play. After 3 hrs he gos back being careful again not to be seen he climbs back in his window, changes back into his clothes he had on. And then slowly gos out of his room. His mom asked did you learn anything? He says yes it was not fun, sorry. His mom asks, what did you do in your room. He says, I layed in bed and read my school books. No one ever knew the truth. As they say they go into space, they could be in a bunker hidden to only make it look like they are. Movies have been using green screens from before the 60s. Another is western health care, watch the documentarys Heal, and pharmaceutical thugs both together show the illusion the western health system implies on us. 3 is religion what you are told by any religion is basic traditionans and how do you tell what is tradition / illusion and what is truth. Now I am not saying there is a god or not, but only saying how do you know what is truth.
How do you know the difference between illusion and realty?
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