When one is clueless one has to apply first-principles. For me those are sānkhya sutras and yoga-sutras

Lagna : body/indriya
Chandra : manas
Surya : ahamkāra/Asmitā

Chandra emphasised more than surya-kunDali because most of us are still under dominance of indriya and manas. https://twitter.com/kal_chiron/status/1252540752183189505

Lagna kunDali most important because “शरीरं आद्यं खलु धर्म साधनम्” (Physical body is the primary instrument of doing dharma).

That is most tangible and we relate to it the most.

In modern era, most aspects (pertaining to problems/threats) of physical body are taken care off.

Hence Chandra kunDali (pertaining to manas) is becoming more and more prominent

Chandra = manas = adhidaivika

Many tāpa (problems) these days are mostly originating from the plane of manas and adhidaivika

And most of us are still under complete influence/control of manas