Calculating the Lot or Part of Fortune
I made a video today on how to calculate the Lot of Fortune, sometimes known as the Part of Fortune, in a natal chart. In modern times the Lots are usually calculated using certain algebraic formulas where the longitudes of the planets are converted into 360 degree notation and then added and subtracted accordingly. For example, the calculation for the Lot of Fortune in a diurnal chart is usually presented as:
Lot = Ascendant + Moon – Sun.
This isn’t they way that the calculation was presented in the ancient traditions of astrology though, but rather in the Hellenistic and Medieval traditions the calculations for the Lots were presented as more of a geometrical formula where you are measuring the distance from one planet to another planet, and then measuring the same distance from the ascendant.
In the video I demonstrate how the Lots were calculated using this method. It is actually quite useful for determining the approximate positions of the Lots very quickly in a chart, or just for ‘eyeballing’ the position of the Lot of Fortune without having to resort to a computer program or a calculator or something.
One point that I meant to make in the video that didn’t come out very clearly is that the same method that I used to calculate the Lot of Fortune in the demonstration can be used to calculate any of the other Lots in the tradition. You just have to substitute the relevant planets in the calculation and make sure that after you count from one planet to another that you measure the same distance from the ascendant going in the same direction that you counted from planet A to planet B in. If you counted clockwise from planet A to planet B in the chart, then you must also count clockwise from the ascendant when you measure the same distance from that point. Conversely, if you counted counterclockwise from planet A to planet B in the chart, then you must also count counterclockwise from the ascendant when you measure the same distance from that point.
So, watch the video and then give the calculation a try with your own chart. You will find that it is actually pretty simple, and after you have done it a few times you will start to understand what the Lots are actually representing in the chart in the first place. The Lot of Fortune was the most important Lot in the Hellenistic and Medieval traditions, but there were dozens, if not hundreds of other important lots which combine different planetary combinations that are also quite useful.
For more information on the Lots please see my paper titled The Theoretical Rational Underlying the Seven Hermetic Lots.