h the calculated superior epoch. Of course, in order for an almanac to be accurate, the adjusted values cannot deviate too much from the measurement values.</p><p>Even in the ancient time, not everyone thought that adjusting the astronomical constants to match the superior epoch was a good idea. For example, in the 4th century, a scholar named D&#249; Y&#249; (杜預) quoted the ancient texts saying that one should make predictions based on observations, instead of altering the measurement values to make pr