Note the word “approximately”. This is because TAI and UTC seconds were not the same prior to 1972, and as a consequence of this, as Shiro has pointed out, the difference between TAI and UTC was not constant prior to 1972 even in the absence of leap seconds. For the purpose of my formal comment, it would have been a distraction to get into the details. So, I was aware of this issue, and should have caught it in the final draft. Sorry about that.
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