| Solar Longitude on the Zodiac | from | to, not including[a] | Lunar longitude correction |
|---|---|---|---|
| middle of Pisces-middle of Taurus[b] | 315° | 15° | 0° |
| middle of Taurus-beginning of Gemini | 15° | 30° | 0°15′ |
| beginning of Gemini-beginning of Leo | 30° | 90° | 0°15′ |
| beginning of Leo-middle of Virgo | 90° | 135° | 0°15′ |
| middle of Virgo-middle of Libra | 135° | 165° | 0° |
| middle of Libra-beginning of Sagittarius | 165° | 210° | -0°15′ |
| beginning of Sagittarius-beginning of Aquarius | 210° | 270° | -0°30′ |
| beginning of Aquarius-middle of Pisces | 270° | 315° | -0°15′ |
|
[a] My understanding of the word usage in the original. [b] See Chapter 11, Law 7 on the start of Jewish Zodiac. (TODO reference) |
|||
The value of mean [lunar longitude] after you add to it or subtract from it or leave it as it is - that is mean lunar longitude approximately a third of an hour after sunset on the date you are calculating it for. And this is what is called mean lunar longitude at observation time.