不需信我 · 自行翻查

110.) In the Appendix to the same book, at p. 438, the proper equation of time, or measurement of the arcs of direction, is also treated of, in reference to the 16th canon of Placidus, which is as follows:— “_To equate the Arc of Direction._ Add the arc of direction to the right ascension of the natal Sun; look for this sum in the table of right ascensions under the ecliptic, and take the degree and minute of longitude corresponding with that sum; then, in the best ephemeris, reckon in how many days and hours the Sun, from the day and hour of birth, has arrived at that degree and minute.