(This method is taken from an ancient treatise on Astrology.)

Ascertain from any almanac the day on which a full moon occurs, and count the number of days from that to the end of the month: you then multiply the number of days in the month by the number ascertained as above, and the total will give you the lucky days (subject to a further test hereafter explained). If the total happens to be, say, 516, the lucky days of that month would be the 5th and 16th, and if it should be 399—as neither of these figures can be paired—the lucky days from that total are the 3d and 9th, and the 9th would be considered doubly lucky, if no tests worked to the contrary.

The unlucky days are determined in precisely the same manner, by multiplying the number of days in the month by the number which have passed previous to a full moon.

After working out your list of lucky days in the manner above described, you must then test them, in order to be sure that there are no opposing influences. You can do this by calculating the unlucky days. Should you find that any day of the month which was designated as lucky came also in the list of unlucky days the latter preponderates and you must strike it from the lucky list.

This plan of demonstrating lucky and unlucky days is very ancient, and has been tested to such an extent that it is considered accurate by most astrologers. In olden times, before the mass of the people understood much about figures, the professional fortune-tellers demanded a large fee for computing the lucky days of any month, which they accomplished in the manner above described.

Lucky marriage days for girls were cast in the same manner, except that the age of the girl was used as the multiplicator, or multiplier, instead of the number of days in the month. The result was determined similarly, and also by a test of the unlucky days. Thus if a girl is eighteen years old, and thinks of marrying in October, she takes up an almanac and ascertains the day of the full moon in that month. If it occurs on the 24th, and there are thirty-one days in the month this leaves seven for the multiplier. She multiplies this by her age, eighteen, and the result is 126, which shows that the lucky days for her marriage in that month are the 12th and 6th, unless they are destroyed by another test, which is determined as follows. There are twenty-three days before the 24th, and she must multiply twenty-three by eighteen, which process gives 414, and shows that the 4th and 14th are the only unlucky days for her marriage. And as they do not conflict with the lucky days, the 6th and 12th may be considered as genuine lucky days for that month, reckoning the moon to be full on the 24th. In determining her age, she should reckon any period over half a year as a full and completed year.

Unlucky Days for Males

Almost all persons (being of male sex) who are born on the days included in the foregoing table will—in a greater or less degree—suffer, not only by pecuniary embarrassments and loss of property, but will also experience great distress and anxiety troubles about their children, daughters forming unhappiness in their family affairs, grave disaffection toward each other among those who are married, trouble about their children, daughter forming unfortunate attachments, and a variety of untoward events of other descriptions. The influences of these days are calculated to excite in the minds of persons born thereon an extraordinary passion for speculation, for change in their affairs, for the initiation of new undertakings, but all of them will tend nearly to one point—loss of property and pecuniary embarrassments. If such persons embark their capital on credit in new concerns or engagements, they will be likely to receive interruptions to the progress of their undertakings. Those who enter into engagements intended to be permanent—whether purchases, leases, partnerships or, in short, any other speculation of a description which cannot readily be transferred or disposed of—will dearly repent their bargains.

They will find their affairs from time to time much interrupted and agitated, and will experience many disappointments in money matters, trouble through bills, and have need of all their activity and address to prop their declining credit; indeed, almost all engagements and affairs that are entered into by persons born on any of these days will receive some sort of check or obstruction. The greater number of such persons will also be subject to sickness.