Hayanaratna · by Balabhadra
Chapter 1 · Planets, Signs, Year Entry
ग्रहराशिस्वरूपवर्षप्रवेशाद्यानयनाधिकारः
अन्यत्रापि ॥आरम्भसन्धेर्द्युचरोयदोनः फलं ददात्यादिमभावजातम् ॥विरामसन्धेरधिकस्तदानीमागामिभावोत्थफलप्रदः स्यादिति ॥
Also elsewhere: When a planet is less than the starting sandhi (junction between two houses), it gives the result of the earlier house. When it is more than the ending sandhi, it gives the result of the coming house.
Simple meaning: Planet outside a house's junctions: before the first junction, the earlier house; past the last, the next house.
अत्रेदमवगन्तव्यम् ॥ यदा कदाचिदेकराशिर्भावद्वये समायाति ॥ अथवा एकराशिं परित्यज्य वा याति ॥ तदा भावकुंडल्यां तादृश एव राशयः स्थाप्याः ॥
One sign in two houses, or a sign left out: draw the house chart just as it comes out.
सन्धिराश्यादितुल्यो ग्रहः पूर्वापरभावसन्धिस्थरेखायामेव स्थाप्यः ॥
Planet exactly on a junction: draw it on the line between the two houses.
अथ च भावकुण्डली केवलंभावफलार्थैव अन्यस्सर्वोपि ताजिकविचारो ग्रहकुण्डल्यैव विधेय इति प्राञ्चः ॥
House chart vs planet chart: the house chart is only for house results; all else from the planet chart.