Surya Siddhanta

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भचक्रनाभौ विषुवद्द्वितयम् समसूत्रगम् । अयनद्वितयम् चैव चतस्रः प्रथितास् तु ताः॥

In the middle of the zodiac (bha-cakra) there are two equinoxes (vishuvat vindu) which lie on the same straight line (samasutraga—that is the diameter). Likewise, the two solstices (ayana vindu) also line up on a diameter. These four points are always mentioned.

english translation