Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Omens
शकुनानि
प्रतिकूलग्रहर्क्षात्तु तथा संमुखमारुतात् ।यात्राकाले रणे वाऽपि च्छत्रादिपतनं भयम् ॥ ३६ ॥
In the full Agni Purana this is chapter 232, verse 36.
From an unfavourable planet or nakshatra (star), and from a wind blowing in the face, there is fear. Fear comes at the time of the journey or in battle. So too when an umbrella and the like falls.
Simple meaning: A falling umbrella with a bad planet or star, or a headwind, brings fear in a journey or battle.
वामं दक्षिणपादेन पादमाक्रमते शुभः ।
An elephant stepping on its left foot with the right, or wiping its right tusk, is good.
वृषोऽश्वः कुञ्जरो वाऽपि रिपुसैन्यगतोऽशुभः ।
A bull, horse or elephant joining the enemy army is bad. Heavy rain from broken clouds can ruin an army.
हृष्टा नराश्चानुलोमा ग्रहा वै जयलक्षणम् ।
Happy men and planets moving rightly mean victory. East, west, north-east and north are good directions.