If the sun was behind the Earth, the camera would be in the shadow, like an eclipse. That would make a horrible picture of the Earth. If you don't understand the concept, consider maybe the pictures were taken at night.
Speaking of night, why are most pictures taken in the day time? Probably another conspiracy to hide the fact that night doesn't exist. How many times have you stayed up all night to be sure it's really dark all that time? Most people are asleep, literally and figuratively. /s
I was riffing off the OP's hilarious "orientation of a photo" logic.
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