About | Sociology/History | Reading The Formulas | Calculations | Interpretation | Sources | List of Lots

- Aries = 0
- Taurus = 30
- Gemini = 60
- Cancer = 90
- Leo = 120
- Virgo = 150
- Libra = 180
- Scorpio = 210
- Sagittarius = 240
- Capricorn = 270
- Aquarius = 300
- Pisces = 330

The traditional way to convert the degrees, and the way I actually learned, is somewhat more cumbersome and confusing for students, given that a single "number" is comprised of portions in several difference bases. I will give a brief example, and leave the details to those who really want to explore the subject.

For example, to calculate the Part of Marriage in my chart using the formula
Asc + H7 - Venus.

This could be written as:

Using the traditional method of calulation, sign is assigned a number of 0-11 on a scale of 12. The degrees remain in a base of 30 (30 degrees per sign), and the seconds of arc are of course 60 per degree. Thus, this could also be written as:

The trick with this is to remember when moving between signs, degrees, and seconds, to carry and subtract in the appropriate base for that portion of the "number." So, if you add the first two "numbers," the seconds add up to 80; you must subtract 60, leaving 20, and carry the number 1 over to the degree column. The advantage of this method is that you can, without performing the calculations, rapidly get a good idea of the sign and house location of the final result, simply by performing a rough calculation based on the houses, and a bit of the degrees. Naturally, to use in a proper delineation, one must have the accurate result to use with transits, directions, and progressions. (NOTE: Trying to calculate arabic parts is basically useless unless one has a rectified chart for the native.)

To perform the same calculation with the simplified approach mentioned
above, you would convert the degrees and write the formula like this:

No matter, how you write it, any of the numerical approaches to calculation will give the same result:

To calculate a formula using a spatial method, also known as the method of the ancients, is very different, and will give different results based on your preferred house system. Be forewarned. A simplistic approach would be to overlay a transparent copy of your chart, with the subtracted planet/point on the natal Asc, and then mark the location of the added planet/point. This is for working purposes only. Since I do not feel secure in my ability to accuractely describe how to properly calculate a part using the spatial method, I gladly refer you to the instruction in Chapter Four, "The Methods," of Granite's book, specifically pages 43-59. Good luck in your explorations!

About | Sociology/History | Reading The Formulas | Calculations | Interpretation | Sources | List of Lots

Last modified August 23, 1997.

Return to the Arabic Parts Page.

Return to the Roof.

Return to the Attic.

Return to Dreamhouse Homepage.

URL of current page: http://www-personal.umich.edu/~pfa/dreamhouse/attic/lots/calc.html