Thread by @DefiledGod

I had earlier pointed out how "secular" texts like kAma sUtra, charaka samhita and Sushruta samhita attribute their knowledge to bhagavAn.

The sUrya siddhAntha, a text on astronomy, also begins with an invocation to nArAyaNa as follows+

अचिन्त्याव्यक्त रूपाय निर्गुणाय गुणात्मने . समस्तजगदाधार मूर्तये ब्रह्मणे नमः

[Salutations to the Supreme Brahman whose nature is incomparable & is not manifest in his avatArAs, who is free of blemishes & full of kalyaNa guNas, whose form is the support of the whole Universe]+

“अचिन्त्याव्यक्त रूपाय” – His divine nature which is incomparable & not manifest to anyone even in his avatArAs. “रूप” means nature here. Only the liberated can see this nature.

“निर्गुणाय गुणात्मने” – One who has no blemishes of triguNAs, & is full of auspicious attributes+

“समस्तजगदाधार मूर्तये” – Whose divine form is the support of the Universe since the weapons and ornaments represent various tattvAs of prakR^iti as per vishNu purANa+

Compare this to the shloka in shAnti parva of same meaning

नमोऽतियशमे तस्मै देवानां परमात्मने । नारायणाय विश्वाय निर्गुणाय गुणात्मने

12th chapter of sUrya siddhAntha has this shloka:

वासुदेवः परं ब्रह्म तन्मूर्तिः पुरुषः परः  । अव्यक्तो निर्गुणः शान्तः पञ्चविंशात् परो ऽव्ययः +

[The Supreme Brahman is vAsudeva, whose primary body is the jIvAtma. He is imperceptible as the antaryAmin, devoid of material attributes, tranquil or free of karma, beyond the 25 tattvAs and the imperishable Cause.]+

Where तन्मूर्तिः पुरुषः परः means he has the jIva called puruSha as his primary "mUrti" or body (with prakR^iti being the secondary body).

This is the sharIrAtma bhAva of Vishishtadvaita+

Then the vyUha forms are described.

Thus, the sUrya siddhAntha joins other works like sushruta samhita and kAma sUtra in attributing the source of their knowledge to nArAyaNa.//