ayana-rtu-virodhe tu parivartyāḥ parasparam | budha-candra surācāryāḥ kuja-śukra-śanaiścaraiḥ ||
When there is a contradiction between the ayana (solstice) and the ritu (season), the two should be mutually interchanged: Mercury, the Moon and Jupiter (the preceptor of the gods) on the one side, and Mars, Venus and Saturn on the other.
Verse 3 — Nasta Jataka: Month and Tithi from Decan Halves
The month is taken from the first half of the drekāṇa (decan), and the other from its second half; the tithi should be known by proportional calculation, being equal to the degrees of the Sun, O twice-born.
Verse 4 — Nasta Jataka: Fixing Birth Time and Judging the Chart
तद्वशादिष्टकालो यो जन्मकालसमो हि सः ।
तत्र ग्रहांश्च भावांश्च ज्ञात्वा तस्य फलं वदेत् ॥ ९॥
tad-vaśād iṣṭa-kālo yo janma-kāla-samo hi saḥ | tatra grahāṁś ca bhāvāṁś ca jñātvā tasya phalaṁ vadet ||
By that means the sought time, which is identical with the moment of birth, is obtained; having ascertained the planets and the bhavas at that time, one should declare the results for the native.
Verse 5 — Nasta Jataka: Samvatsara from Jupiter's Twelve-Year Cycle
Jupiter, after twelve years, comes again to occupy that same sign; according to which cycle of revolutions this occurs, the corresponding samvatsara (year-name) is to be known, O sage.
Verse 6 — Nasta Jataka: Age-Based Estimation of the Samvatsara
saṁvatsarasya sandehe praśna-kartur dvijottama | vayo-'numānas tas tatra dvādaśa dvādaśa kṣipet ||
When there is doubt about the samvatsara, then, O best of the twice-born, from an estimation of the querent's age, twelves should be added upon twelves.
Verse 7 — Nasta Jataka: Jupiter in Lagna or Trine for Remaining Doubt
If doubt still arises even there, Jupiter should be assumed to be posited in the lagna or in a trine; thereafter, from the estimation of age, the year is determined as before.