Ephemerides sive almanach perpetuus

occurring because of the diversity of meridians, if you wish to pursue any moments, however small. You will resolve this by this law. In the table of regions of this same Johannes, which I mentioned above concerning Toledo, provided here in the calendar, take the name of your dwelling if it is written there, or the nearest one, and add the number that appears directly opposite it next to the mark 'a' add or 'm' minus/subtract to your proposed time for which you wish to take the motion. Similarly, do this for the time of the conjunction or opposition of the Sun and Moon, or for aspects taken from the lunar Ephemeris, and also for the time of the entry of the Sun into the signs, and similarly for the conjunctions of the planets, and also for the eclipses of the luminaries, which are most openly written so as to be easily known in the text of the tables annexed at the end. If the mark 'a' occurs, add, or subtract from the same if the mark 'm' is present. That column of numbers that appears next to the former order of the marks 'a' and 'm' comprises the hours and minutes of them. The posterior order, however, simply shows by how many degrees the pole of the world is understood to be noted above the horizon of any place.

The table of the Indictional Cycle, solar or lunar, etc., is exposed immediately after the calendar, as is known from the inscription. You may easily discover the number of the indiction for any current year in this way: once the number of centuries passed from the birth of Christ to your proposed year is known, which the first order of the table contains. Then adapt the first century to the number of the second order first expressed there, namely 13; to the following, 8; to the second century, 300 This likely refers to a calculation method rather than literal addition of 300; but the number of indictions does not extend downward there. Apply the fourth century again to the first number, namely 13; and in this way calculate in sequence until you have brought it to the last century. For where it finds its seat, there you will have the number of the indiction corresponding to the current century. And if no years had passed beyond the century, the current indiction would be 0. If, however, some years have perhaps passed, note the number of the indiction corresponding to this century in the sixth order of numbers (which is common to individual cycles according to the expression of the inscription) where it is written. And to the number immediately following, give the first number of the collected years noted in the first part of the order of numbers immediately proposed; to the following, the second, and so on in sequence, just as you did with the numbers of the centuries, until you arrive at the number of years nearest to your year. Those numbers of years of the first part ought to be ordered thus: 16, 32, 48, 64, 80, 96; for they are found to be false if printed in haste. But to return to the point: that number of the indiction would be current for those years collected that were closest, if a few years had not passed. But if some have flowed by, give the first number of the years extended to the number of the indiction appearing continuously afterward, and again the second to the following, etc. Apply single numbers to single extended years. For where the calculation of such a number of extended years ends, there, in the sixth order of numbers common to the cycles in the series of the indiction number which does not exceed 15, you will recognize the sought number of the indiction. In no different way will you find the lunar cycle, that is, the golden number, and the solar cycle, that is, the number measuring the revolution of the Sunday letters, in whatever year you wish, if you proceed by the same way as you did in finding the indiction, applying the numbers of the centuries and the collected years ascribed to them, and simultaneously in the sixth order in the series of each of them, of which the first takes 19 numbers, the second uses every number, namely 28.

As for the solar cycle and the golden number found as above, next to it in a line directly toward the right, you will continuously see the number of the original: "cla..." - likely clavis (key)