1. Examine the preceding syzygy, whether it was a new moon or a full moon.
2. If the preceding syzygy was a new moon, observe its degree at the time of the nativity.
3. If the preceding syzygy was a full moon by night, we observe the degree of the syzygy. By day, we observe the degree opposite the syzygy, which is the degree of the luminary above the horizon (in that case the Sun).
4. Observe the degree at the approximate time of the nativity, and give a point to any of the following planets with rulership over the degree at the time of birth
(see http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Ptolemy/Tetrabiblos/3A*.html#note9)
5. Give a point to any planet in the same sign as the degree or in sign with some aspect (sextile, square, trine or opposition) to it.
6. If one star is familiar with the degree in all or most of these ways, whatever degree of its sign it is passing at the time of birth, the same numerical degree is rising (Asc) or culminating (Mc) at the time of birth.
7. If two or more stars are predominators, observe the one that is closer to the approximate time. If it so happens that we do not have the nearest hour of birth, we can establish it through combination of accidental qualities. The foregoing rectification is for time with approximate hour.