Surya Siddhanta
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विस्तरेणैतद् उदितम् सम्क्षेपाद् व्यावहारिकम्। मध्यमानयनम् कार्यम् ग्रहाणाम् इष्टतो युगात् ॥
These processes are mentioned (from 45th Śloka to 54th) in detail, but, for convenience' sake, let (an astronomer) computing the elapsed terrestrial days from the beginning of the Tretá yuga, find easily the mean places of the planets.
english translation
vistareNaitad uditam samkSepAd vyAvahArikam। madhyamAnayanam kAryam grahANAm iSTato yugAt ॥
hk transliteration by Sanscriptअस्मिन् कृतयुगस्यान्ते सर्वे मध्यगता ग्रहाः। *विना तु पातमन्दोच्चान् मेषादौ तुल्यताम् इताः (ड् विनेन्दु) ॥
At the end of this Kríta yuga the mean places of all the planets, except their nodes and apogees, coincide with each other in the first point of stellar Aries.
english translation
asmin kRtayugasyAnte sarve madhyagatA grahAH। *vinA tu pAtamandoccAn meSAdau tulyatAm itAH (D vinendu) ॥
hk transliteration by Sanscriptमकरादौ शशाङ्कोच्चम् तत्पातस् तु तुलादिगः। निरम्शत्वम् गताश् चान्ये नोक्तास् ते मन्दचारिणः ॥
(At the same instant) the place of the Moon's apogee=nine signs, her ascending node=six signs, and the places of the other slow moving apogees and nodes, whose revolutions are mentioned before, are not without degrees (i. e. they contain some signs and also degrees).
english translation
makarAdau zazAGkoccam tatpAtas tu tulAdigaH। niramzatvam gatAz cAnye noktAs te mandacAriNaH ॥
hk transliteration by Sanscriptयोजनानि शतान्य् अष्टौ भूकर्णो द्विगुणानि तु। तद्वर्गतो दशगुणात् पदम् भूपरिधिर् भवेत् ॥
The diameter of the Earth is 1600 Yojanas. Multiply the square of the diameter by 10, the square-root of the product will be the circumference of the Earth.
english translation
yojanAni zatAny aSTau bhUkarNo dviguNAni tu। tadvargato dazaguNAt padam bhUparidhir bhavet ॥
hk transliteration by Sanscriptलम्बज्याघ्नस् त्रिजीवाप्तः स्फुटो भूपरिधिः स्वकः। १-६०ख तेन देशान्तराभ्यस्ता ग्रहभुक्तिर् विभाजिता ॥
The Earth's circumference multiplied by the sine of co-latitude (of the given place) and divided by the radius is the Sphuṭa or rectified circumference (i. e. the parallel of latitude), at that place. Multiply the daily motion (in minutes) by the distance of the given place from the Middle Line of the Earth, and divide the product by the rectified circumference of the Earth.
english translation
lambajyAghnas trijIvAptaH sphuTo bhUparidhiH svakaH। 1-60kha tena dezAntarAbhyastA grahabhuktir vibhAjitA ॥
hk transliteration by Sanscript