Note 282 — Chapter X · THE PERIODICAL DIVISIONS OF TIME

Placidus observes, that “the primary directions of the significators to their promittors, and the lords of the terms, Ptolemy calls the General Arbiters of Times, because they pre-ordain the general times of their effects; which, as its motion is slow and its perseverance long, discovers its effects after a very long time; that is, after months and years. In order that we may know, in this extent of time, on what particular month and day the effects appear, Ptolemy proposes these motions for observation, wherein, when the majority of the causes agree together, then doubtless the effect is accomplished, or most clearly manifests itself.” (Cooper’s Translation, p. 109.) And he says afterwards, in speaking of secondary directions, progressions, ingresses, &c., “these subsequent motions of the causes demand our greatest attention.” (Ibid., p. 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. The number of days indicate as many years; every two hours over, reckon a month.” (Ibid., p. 55.)