Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Portents, Comets
ग्रहचारः केतवश्च
अवृष्टिदश्चरन्भौमो दक्षिणेरोहिणीस्थितः ।भूमिजः सर्वधिष्ण्यानामुदगामी शुभप्रदः ॥ ३७ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 37.
... brings no rain. So does Mars standing south of Rohini. Mars north of all the stars brings good results.
Simple meaning: Mars moving in those stars brings no rain. Mars north of the stars brings good.
याम्यगोऽनिष्टफलदो भवेद्भेदकरो नृणाम् ।
Mars going south gives bad results. Mercury never rises without some strange omen.
अनावृष्ट्यग्निभयकृदनर्थनृपविग्रहः ।
Mercury's rising can bring drought, fire fear and war between kings.
भिनत्ति यदि तत्तारां बाधावृष्टिभयंकरः ।
Mercury splitting those stars brings trouble and fear of drought.