_N. B._ Sometimes it happens that the days annexed to the Centuries in Table V are more in number than the days on which the New or Full Moon happens in _March_ the year of the 18th Century, with which the computation begins; as in the third following Example, _viz._ for the Full Moon in _March_ the year before CHRIST 721: in which case, a Lunation and it’s Anomalies must be added, from Table VI, to the days and Anomalies of the New or Full Moon in _March_; and then, subtraction can be made: and having gained a remainder, work in all respects as taught in § 355. _To find the time of New or Full Moon in any given year and month before the Christian Æra._ 356. PRECEPT I. Find a year of the 18th Century, which added to the given number of years before CHRIST, diminished by one, shall make a number of whole Centuries. II. Find this number of Centuries in Table V, and subtract the Time and Anomalies answering to it from the Time and Anomalies answering to the mean New or Full Moon in _March_ the year of the 18th Century thus found; and they will give the mean time of New or Full Moon in _March_ the given year before CHRIST, with the Anomalies answering thereto. Whence the true time of that New or Full Moon may be had by the Precepts already delivered § 355. III. The Tables are calculated for the Meridian of _London_: therefore, in computing for any place westward of _London_, four minutes of time must be subtracted from the time shewn by the Tables, for every degree the place is westward; and added for every degree it is eastward. See § 210. EXAMPLE I. _To find the time of New Moon at_ London _and_ Athens _in_ March, _the year before Christ 424._ The years 423 added to 1777 make 2200, or 22 Centuries.