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दशामनां भयातघ्नं भभोगेन हृतं फलम् । दशाया भुक्तवर्षाद्य भोग्यं मानाद् विशोधितम् ॥ १६॥
To find out the remainder of the Dasha, operating at the time of birth, first find out the expired portion of the Dasha of the concerned Grah. This is done, as follows. Multiply the Dasha period of the Grah concerned by the period of the stay of Candr in Janm Nakshatr, that has expired and divide that amount by the total period of the stay of Candr in that Nakshatr. The figure in years, months etc. so arrived at will be the expired period of the Dasha. If this figure is deducted from the total period of the Dasha, we will get the balance of Dasha at the time of birth.
english translation
लग्नेशात् केन्द्रकोणस्थे राहौ लग्नं विना स्थिते । अष्टोत्तरी दशा विप्र विज्ञेया रौद्रभादितः ॥ १७॥
Maharishi Parashar said. O Brahmin, the sages have recommended the adoption of Ashtottari, when Rahu not being in Lagn, in any other Kendr, or Trikon to the Lord of the Lagn.
english translation
चतुष्कं त्रितयं तस्मात् चतुष्कं त्रितयं पुनः । एवं स्वजन्मभं यावद् विगणय्य यथाक्रमम् ॥ १८॥
From 4 Nakshatras from Ardra commences the Dasha of Sūrya, from 3 after that begins the Dasha of Candr, 4 after that will bring the Dasha of Mangal, 3 after that the Lord of Dasha will be Budh, 4 therefrom will have Śani, as the Dasha Lord, 3 thereafter the Lord will be Guru, Rahu will be the Lord of the Dasha 4 Nakshatras after that and then Śukr will take over the lordship of the Dasha 3 Nakshatras from the last one mentioned above.
english translation
सूर्यश्चन्द्रः कुजः सौम्यः शनिर्जीवस्तमो भृगुः । एते दशाधिपा विप्र ज्ञेयाः केतुं विना ग्रहाः ॥ १९॥
The Lord of the Dasha at birth will be determined by counting in this order up to the Janm Nakshatr. The duration of Ashtottari Dasha for Sūrya, Candr, Mangal, Budh, Śani, Guru, Rahu and Śukr.
english translation
रसाः पञ्चेन्दवो नागाः सप्तचन्द्राश्च खेन्दवः । गोऽब्जाः सूर्याः कुनेत्राश्च रव्यादीनां दशासमाः ॥ २०॥
6, 15, 8, 17, 10, 19, 12 and 21 in that order. Thus in this Dasha system only 8 Grahas play the role of Dasha Lords, Ketu having been denied this privilege.
english translation