Hi Ernst and all,
I was going through BPHS and I came across the chapter on special ascendants. While Parashara gives sutras for calculation of special ascendants like Bhava Lagna, Hora Lagna, Ghatika Lagna, Pranapada, etc., I really haven't found enough resource elaborating why such ascendants are supposed to be used, and the indications of those ascendants.
I'd be more than pleased if I were to understand the use of such ascendants in a more elaborate and comprehensive manner.
This is a really fascinating topic and one of the lessons that was more notable for me. I still have ideas about the deeper significance of these.
You'll find Ernst teaching these in his Jaimini Sutras audio course Pada 3. If you already have the text it is Sutra 1 Pada 3, sloka 24-27. In the manual Ernst includes the passages from BPHS on this topic so it's quite nice to have both to work with.
He also goes into this a bit in the Muhurta course but not as in depth (if I recall rightly) as the jaimini audio course