Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Travel Muhurta
यात्रामण्डलचिन्ता
सर्वयात्रां प्रवक्ष्यामि राजधर्मसमाश्रयात् ।अस्तं गते नीचगते विकले रिपुराशिगे ॥ १ ॥
In the full Agni Purana this is chapter 233, verse 1.
I will tell about all journeys, as they rest on a king's duty. Do not travel when Venus is set, in its nicha (low point), weak, or in an enemy's sign.
Simple meaning: Do not start a journey when the planet is set, weak or in an enemy sign.
प्रतिलोमे च विध्वस्ते शुक्रे यात्रां विवर्जयेत् ।
Avoid travel when Venus, Mercury or the planet of your direction is moving backward or ruined.
वैधृतौ च व्यतीपाते नागे च शकुनौ तथा ।
Do not travel on the bad Sun and Moon yogas or on the fixed bad half-days.
विपत्तारे नैधने च प्रत्यरौ चाथ जन्मनि ।
Avoid travel on the unlucky star counts, on the birth star, at sign edges and on empty moon days.