Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Travel Muhurta
यात्रामण्डलचिन्ता
विपत्तारे नैधने च प्रत्यरौ चाथ जन्मनि ।गण्डे विवर्जयेद्यात्रां रिक्तायां च तिथावपि ॥ ४ ॥
In the full Agni Purana this is chapter 233, verse 4.
Avoid travel on the Vipat tara (star count from the birth nakshatra). Avoid the Naidhana tara and the Pratyari tara, and the birth nakshatra (star) itself. Avoid it in gandanta (the edge-point between signs) and on a rikta (empty tithi) day too.
Simple meaning: Avoid travel on the unlucky star counts, on the birth star, at sign edges and on empty moon days.
उदीची च तथा प्राची तयोरैक्यं प्रकीर्तितम् ।
North and east go together as one. West and south go together as one.
वाय्वग्निदिक्समुद्भूतं परिघं न तु लङ्घयेत् ।
Do not cross the line from north-west to south-east. Sunday, Monday and Saturday are not good.
कृत्तिकाद्यानि पूर्वेण माघाद्यानि च याम्यतः ।
Each group of stars belongs to a direction: Krittika east, Magha south, Anuradha west, Dhanishta north.