Oh, dude, a tad is like a super scientific unit of time measurement. It's like really precise and stuff. So, technically speaking, a tad is like a fraction of a moment, you know, like a tiny smidge of time. But who's really keeping track, right?
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A long time ago a king wanted to see how long his foot was. His foot was exactly 12 feet long so he called that a foot.
Because the definition of a lightyear is: how long light can travel in a year. Hope this helped;)
Your height isn't as important as the time of day of the measurement. When the sun is directly overhead, your shadow won't be measurable.
100km is a distance, not a measurement of time. (kilometres)
Accurate measurements of time become possible after accurate measurement of length and mass because time taken by a heavy body to move a certain distance is more,and time taken by a light body to move a certain distance is less.