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Surya Siddhanta

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ताराग्रहाणाम् अन्योन्यम् स्याताम् युद्धसमागमौ। समागमः शशाङ्केन सूर्येणास्तमनम् सह॥

Of the star-planets there take place, with one another, encounter (yuddha) and conjunction (samagama) ; with the moon, conjunction (samagama) ; with the sun, heliacal setting (astamana). [The " star-platiets " (tardgraha) are, of course, the five lesser planets, exclusive of the sun and moon. Their conjunctions with one another and with the moon, with the asterisms (nakshatra), and with the sun, are the subjects of this and the two following chapters. Eor the general idea of " conjunction " various terms are indifferently employed in this chapter, as samagama, " coming together," samyoga, " conjunction,*' yoga, " junction " (in viii. 14, also, melaka, " meeting ") the word yuti, " union," which is constantly used in the same sense by the commentary, and which enters, into the title of the chaptef, grahayutyadhih&ra, does not occur anywhere in the text. The word which we translate " encounter," yuddha, means literally " war, conflict." Verses 18-20, and verse 22, below, give distinctive definitions of some of the different kinds of encounter and conjunction.]

english translation

शीघ्रे मन्दाधिके +अतीतः सम्योगो भवितान्यथा । द्वयोः प्राग्यायिनोर् एवम् वक्रिणोस् तु विपर्ययात्॥

When the longitude of the swift-moving planet is greater than that of the slow one, the conjunction (samyoga) is past; otherwise, it is to come : this is the case when the two are moving eastward; if, however, they are retrograding (vakrin), the contrary is true.

english translation

प्राग्यायिन्य् अधिके +अतीतो वक्रिण्य् एष्यः समागमः। ग्रहान्तरकलाः स्वस्वभुक्तिलिप्ताः समाहताः॥

When the longitude of the one moving eastward is greater, the conjunction (samagama) is past ; but when that of thfe one that is retrograding is greater, it is to come. Multiply the distance in longitude of the planets, in minutes, by the minutes of daily motion of each.

english translation

भुक्त्यन्तरेण विभजेद् अनुलोमविलोमयोः। द्वयोर् वक्रिण्य् अथैकस्मिन् भुक्तियोगेन भाजयेत्॥

And divide the products by the difference of daily motions, if both are moving with direct, or both with retrograde, motion : if one is retrograding, divide by the sum of daily motions.

english translation

लब्धम् लिप्तादिकम् शोध्यम् गते देयम् भविष्यति। विपर्ययाद् वक्रगत्योर् एकस्मिम्स् तु धनव्ययौ॥

The quotient, in minutes, etc., is to be subtracted when the conjunction is past, and added when it is to come : if the two are retrograding, the contrary : if one is retrograding, the quotients are additive and subtfactive respectively.

english translation