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The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is 299,792,458 metres per second(approximately 300,000 km/s (186,000 mi/s)[Note 3]). It is exact because by international agreement a metre is defined to be the length of the path travelled by light in vacuum during a time interval of 1/299792458 second
so speed of light is that cause of an agreement because of an internatiional agreement
not necessarily cause its TRUE
they basically said well a meter is this so light moves this fast
I see what you're saying, the same way "time" (minutes/hours/days) is a purely constructed concept based on our own perspective (the length of time that it takes this specific planet to rotate divided into even units) while time (before/now/after) is objective as far as we can prove.
the units of measurement we choose only measure an attribute, not define it.