Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Portents, Comets
ग्रहचारः केतवश्च
सितरक्तैः पीतकृष्णैर्वर्णैर्विप्रादिपीडनम् ।घ्नंति द्वित्रिचतुर्वर्णैर्भुवि राजजनान्मुने ॥ ६ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 6.
White, red, yellow and black marks may trouble the brahmins and the other classes, in order. Marks of two, three or four colours may put the lives of royal people on earth at risk, O sage.
Simple meaning: Coloured marks on the Sun may trouble the four classes. Many-coloured marks can put royal lives at risk.
ऊर्द्धैर्भानुकरैस्ताम्रैर्नाशं याति चमूपतिः ।
Copper, yellow, white or many-coloured upward Sun rays point to risk for the army chief, prince, priest or people.
धूम्रैर्नृपपिशंगैस्तु जलदाधोमुखैर्जगत् ।
Smoky rays may harm the king, downward rays the world. Tawny rays bring rain. A copper late-winter Sun is good.
ग्रीष्मश्चापांडुरश्चैव विचित्रो जलदागमे ।
The Sun has a set colour in each season, such as many colours in the rains.