tch the superior epoch without sacrificing almanac accuracy. However, large N made almanac calculations inconvenient. So there was a tradeoff between computational convenience and accuracy. The upper bound for N was chosen to be 100 million years. As observation accuracy continued to improve, the restriction on N became the limiting factor for the almanac accuracy, eventually leading to the abolishment of the superior epoch.</p><br><sect id="abolishment">Abolishment of the Superior Epoch</sect><p>The major 