Quote:
Originally Posted by Aurificus
changing thermal gradient
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These are key words.
But they are not alone. There's also other aspects as electric field gradient, which behaves pretty much similar as wind gradients found close to sea level.
Detection is not exclusively IR, but also due to that. No constant time period of detection: 10 to 2 PM. No, it's all day long, including night when depending of the case, detection is clearer.
Theory is only one piece of many. You still have a long way to go.