If it takes light about 8 minutes to reach earth from the sun, we're seeing the sun as it was eight minutes ago. If that holds true, then what we see everyday is actually the reflected light from several nano-seconds ago. We see a small subdivision of the past. Technically, we cannot biologically process anything as it actually happens. The only place where something instantaneous can happen is the mind, but then it only exists in the present at the instant the thought happens, and then it slips into the near past. You can't define the exact instant a thought happens, because measurements are technically continuous and infinitely sub-divisible, so the present doesn't exist, but only varying degrees of the past, because the future hasn't happened yet and any predictions of that future happened in the past. So, therefore, the past encapsulates all of our understanding of time.
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