Why is sin(X + 100 Quantillion) a straight line?

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I was messing around in Desmos, inputting random numbers in to the sine function just to pass the time. So, I inputted:

$sin(x + 1000000000000000000)$ (100 quantillion)

and I was confused to as to why this was a straight line? Is this just an error with the calculator or is this mathematically correct? If so, why?

Any help would be appreciated!