Hayanaratna · by Balabhadra
Chapter 3 · The Sixteen Yogas
षोडशयोगाध्यायः
तत्र वर्तमानमुथशिलयोगलक्षणमुक्तं ताजिकालंकारे ॥दृष्टौ सत्यां प्रोक्तदीप्ताख्यभागैर्मंदात् खेटाच्छीघ्रखेटो यदाल्पः ॥अंशैस्तुल्यः किंचिदूनस्तदेत्थशालो योगो मूथशीलः स एवेति ॥
There, the definition of the present ithasala (planets moving toward an exact aspect) yoga is given in the Tajikalankara. When there is an aspect within the stated deepta degrees (the planet's orb of light), look at the fast planet. The fast planet may have fewer degrees than the slow planet. It may have the same, or a little less. Then it is the ithasala yoga. It is also called muthashila.
Simple meaning: Present ithasala: planets in aspect, and the fast planet has slightly fewer degrees than the slow one.
अत्रेत्थशालादियोगेषु ग्रहाणां शीघ्रगत्वं मंदगत्वं च स्पष्टगत्या ज्ञेयम् ।
Fast and slow planets are decided by true daily motion.
अत्र केचिच्छीघ्रमंदग्रहयोरेकराशिस्थयोरेव मुथशिलयोगः नवमपंचमादिभिन्नराशौ यतः समरसिंहेन मध्यमाधमकम्बूललक्षणे मेषस्थेब्जेशनिना कर्कस्थे भूभुवास्त्रियाङ्कविना॥मकरस्थे गुरुणा सह मीनस्थे ज्ञे न शुभश्चेतिपद्येनैकराशौ मुथशिलयोगोभिहितो न भिन्नराशावितिचेन्न यतस्तेन तत्रैव नीचगयोर्ग्रहयोरित्थशालः कार्यनाशकः प्रोक्तस्तद्यथा ॥
An objection: ithasala only within one sign. Samarasimha's lines on planets in their low signs are used for this.
इक्कवालयोगः
Ikkabala example chart: every planet stands in a corner or a succeeding house.