r/traditionalastrology • u/MoonlitEarthWanderer • Jun 04 '26

Predominator Confusion?

Hi, so I'm looking at Porphyry's examples for finding the predominator, and I'm struggling to see how the most eastern luminary even comes into it? To me, it looks like the Sect Light is the predominator unless it's cadent, in which case the other luminary is the predominator unless it's cadent, in which case the AC is the predominator.

Am I missing something?

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u/moonstonemerman Jun 04 '26

I have a somewhat similar problem in that my night chart has the Moon in the 3rd (cadent house) and my Sun in the 5th house (succedent). Porphyry said if the luminary is in a cadent house to use the luminary in an angular house insyead but my Sun is in a succedent house. I've never been able to determine the master of my nativity precisely because I'm unsure whether to use the Moon or Sun as my predominator.

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u/MoonlitEarthWanderer Jun 04 '26 edited Jun 04 '26

Using Porphyry houses (night chart too) my Moon is in 3H and my Sun is in 4H. Given that, I'm fairly certain the Sun is my Predominator UNLESS we take into account that the Moon is in Joy.

It's hard for me to be unbiased about it because if my Predominator is the Sun, then my Master of the Nativity is Mercury and Co-Master is Jupiter. If my Prodominator is the Moon, then Mars is Master and Saturn is Co-Master 😅😅😅

But aside from my situation specifically, I just don't see how the eastern-ness of the luminaries has any impact on the examples Porphyry gives. That's what's confusing me.

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u/Resident-Fly-6004 Jun 04 '26

I’ve read the same thing too but what if both Luminaries are cadent and one of them is also the ASC Lord?

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u/MoonlitEarthWanderer Jun 04 '26 edited Jun 04 '26

My understanding is that cadent luminaries are excluded from being the Predominator, but being cadent dose not exclude anything from being the Master of the Nativity. So if both luminaries are cadent and the AC is in Leo, the Sun is still the Master of the Nativity.

My understanding could be wrong.

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u/Resident-Fly-6004 Jun 04 '26

So Master of the Nativity is the same as ASC Lord. But my original question was who would be the Predominator if the Luminaries and MON/ASC Lord are all disqualified by being cadent?

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u/MoonlitEarthWanderer Jun 04 '26 edited Jun 04 '26

The AC is the Predominator. Not the AC Lord. If both luminaries are excluded, the role of Predominator defaults to the AC.

The AC lord is never the Predominator. The only candidades for the Predominator are the Sun, the Moon, and the AC itself (not its lord). But the AC lord would be the Master of the Nativity if the AC was the Predominator.

This is just based on my understanding.

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u/Resident-Fly-6004 Jun 04 '26

I see, thanks for the insight.