Surya Siddhanta
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अत्यासन्नतया तेन ग्रीष्मे तीव्रकरा रवेः। देवभागे सुराणाम् तु हेमन्ते मन्दतान्यथा॥
Hence, owing to his exceeding nearness, the rays of the gun are hot in the hemisphere of the gods in summer, but in that of the demons in winter : in the contrary season, they are sluggish.
english translation
देवासुरा विषुवति क्षितिजस्थम् दिवाकरम् । पश्यन्त्य् अन्योन्यम् एतेषाम् वामसव्ये दिनक्षपे॥
At the' equinox, both gods and demons see the sun in the horizon ; their day and night are mutually opposed to each other.
english translation
मेषादाव् उदितः सूर्यस् त्रीन् राशीन् उदगुत्तरम् । सञ्चरन् प्रागहर्मध्यम् पूरयेन् मेरुवासिनाम् ॥
The sun, rising at the first of Aries, while moving on northward for three signs, completes the former half-day of the dwellers upon Meru; . -
english translation
कर्क्यादीन् सञ्चरम्श् तद्वद् अह्नः पश्चार्धम् एव सः। तुलादीम्स् त्रीन् मृगादीम्श् च तद्वद् एव सुरद्विषाम्॥
In like manner, while moving through the three signs beginning with Cancer, he completes the latter half of their day : he accomplishes the same for the enemies of the gods while moving through the three signs beginning with Libra and the three, beginning with Capricorn, respectively.
english translation
अतो दिनक्षपे तेषाम् अन्योन्यम् हि विपर्ययात् । अहोरात्रप्रमाणम् च भानोर् भगणपूरणात् ॥
Hence are their night and day mutually opposed to one another ; and the measure of the day and night is by the completion of the sun's revolution.
english translation