Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Portents, Comets
ग्रहचारः केतवश्च
भिनत्ति यदि तत्तारां बाधावृष्टिभयंकरः ।आर्द्रादिपितृभांतेषु दृश्यते यदि चंद्रजः ॥ ४० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 40.
... if it splits their star, it brings trouble and fear of drought. If Mercury is seen in the stars from Ardra to Magha ...
Simple meaning: Mercury splitting those stars brings trouble and fear of drought.
तदा दुर्भिक्षकलहरोगानावृष्टिभीतिकृत् ।
Mercury in the stars from Ardra to Magha brings famine, quarrels, illness and drought.
क्षेमं सुभिक्षमारोग्यं कुरुते रोगनाशनम् ।
Mercury in the six stars from Hasta brings welfare, food and health.
भिषक्तरंगवाणिज्यवृत्तीनां नाशकृत्तदा ।
Mercury in those stars may harm the work of doctors, seafarers and traders.