Perhaps I'm missing some sarcasm, but the article states that two clocks, one synchronized to the earth's rotation, and the other keeping atomic time, they woul

Perhaps I'm missing some sarcasm, but the article states that two clocks, one synchronized to the earth's rotation, and the other keeping atomic time, they would drift by a total of 4 hours over 2500 years, not drift by 4 hours per day. Those are completely different things.