Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Portents, Comets
ग्रहचारः केतवश्च
कृष्णाष्टम्यां चतुर्दश्याममायां च यदा सितः ।उदयास्तमनं याति तदा जलमयी मही ॥ ७० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 70.
Venus may rise or set on the 8th or 14th tithi (moon day) of the dark half. Or it may do so on the new moon day. Then the earth is full of water.
Simple meaning: Venus rising or setting on those days tends to bring heavy rain.
मिथः सप्तमराशिस्थौ पश्चात्प्राग्वीथिसंस्थितौ ।
Jupiter and Venus opposite each other, one west and one east, can bring drought, famine and war.
कुजज्ञजीवरविजाः शुक्रस्याग्रेसरा यदि ।
Mars, Mercury, Jupiter and Saturn moving ahead of Venus can bring war, storms, famine and drought.
जलमित्रार्यमाहींद्रनक्षत्रेषु सुभिक्षकृत् ।
Venus in some stars brings plenty of food, in Mula war and drought, and in two others fear.