what is time?
地球自轉一次叫一日？
地球圍繞太陽一圈叫一年？
後來，好似用石英Quartz 來計算時間。
But, all of them are the unit of time or the measure of time, but they are not time itself. so, what is time?
before now is past?
after now is future?
then, what is now?
now is not a static point, it moves.
when you look at (1), this now, but when you look at (2), this is also now and (1) becomes past. so, what is now? (1) or (2)?
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