Shashtyamsha
Shashtiamsa - meaning the 60th division, in Hindu astrology refers to the 60th division or varga of a Rasi or Sign equally divided or half-degree each. It is one of the sixteen shodasvargas that are considered important and relevant to important aspects of life. Virupas, a measure of planetary or bhava strength, are also known as Shashtiamsas.
Parasara’s explanation
In his Bṛhat Parāśara Horāśāstra, Parasara has defined the sixteen shodasvargas; with regards to the Shashtiamsa sub-division of a sign he states – ignore the sign position of a planet and take the degrees etc. it traversed in that sign. Multiply that figure by 2 and divide by 12, then, add 1 to the remainder which will indicate the sign in which the Shashtiamsa falls; the lord of that sign is the planet ruling the said Shashtiamsa. He has listed in a particular order the names of the sixty shashtiamsas falling in odd signs which order, he says, should be reversed for even signs. Planets in benefic shashtiamsas produce auspicious results while the opposite is true in case of planets in malefic shashtiamsas. In the context of varga classification he clarifies that the divisions falling in the planet’s exaltation sign, moolatrikona sign, own sign, and the signs owned by the lord of a kendra from the graha arudha are all to be considered as good vargas but not those divisions of a combust planet, defeated planet, weak planet and a planet in bad avastha situated wherein situated planets destroy yogas .List showing names and order of Shashtiāmsās
| S.No.ODD signs up to | Shashtiamsa | Benefic or Malefic | S.No.EVEN signs |
| 1 | Ghorānsh | Malefic | 60 |
| 2 | Rākshasa | Malefic | 59 |
| 3 | Deva | Benefic | 58 |
| 4 | Kuber | Benefic | 57 |
| 5 | Rakshogana | Benefic | 56 |
| 6 | Kinnar | Benefic | 55 |
| 7 | Bhrshta | Malefic | 54 |
| 8 | Kulaghna | Malefic | 53 |
| 9 | Garala | Malefic | 52 |
| 10 | Agni | Malefic | 51 |
| 11 | Māyā | Malefic | 50 |
| 12 | Yama | Malefic | 49 |
| 13 | Varuna | Benefic | 48 |
| 14 | Indra | Benefic | 47 |
| 15 | Kāla | Malefic | 46 |
| 16 | Ahibhāga | Benefic | 45 |
| 17 | Amrtānshu | Benefic | 44 |
| 18 | Chandra | Benefic | 43 |
| 19 | Madu | Benefic | 42 |
| 20 | Komala | Benefic | 41 |
| 21 | Padma | Benefic | 40 |
| 22 | Vishnu | Benefic | 39 |
| 23 | Vāgāsh | Benefic | 38 |
| 24 | Dingchar | Benefic | 37 |
| 25 | Dava | Benefic | 36 |
| 26 | Ārdra | Benefic | 35 |
| 27 | Kālanāsha | Malefic | 34 |
| 28 | Kshitish | Benefic | 33 |
| 29 | Kamalākar | Benefic | 32 |
| 30 | Manda | Malefic | 31 |
| 31 | Mrtyu | Malefic | 30 |
| 32 | Kāla | Malefic | 29 |
| 33 | Dāvagni | Malefic | 28 |
| 34 | Ghora | Malefic | 27 |
| 35 | Maya | Malefic | 26 |
| 36 | Kantaka | Malefic | 25 |
| 37 | Sudhā | Benefic | 24 |
| 38 | Amrta | Benefic | 23 |
| 39 | Poornachandra | Benefic | 22 |
| 40 | Vishpradimā | Malefic | 21 |
| 41 | Kulanāsha | Malefic | 20 |
| 42 | Mukhya | Benefic | 19 |
| 43 | Vanshakshya | Malefic | 18 |
| 44 | Utpāta | Malefic | 17 |
| 45 | Kālroopa | Benefic | 16 |
| 46 | Saomaya | Benefic | 15 |
| 47 | Mrdu | Benefic | 14 |
| 48 | Sheetala | Benefic | 13 |
| 49 | Danshtrākarā | Malefic | 12 |
| 50 | Indumukha | Malefic | 11 |
| 51 | Praveena | Benefic | 10 |
| 52 | Kālagni | Malefic | 9 |
| 53 | Dandayudha | Benefic | 8 |
| 54 | Nirmala | Benefic | 7 |
| 55 | Shubha | Benefic | 6 |
| 56 | Ashubha | Benefic | 5 |
| 57 | Atisheeta | Benefic | 4 |
| 58 | Sudhāyoga | Benefic | 3 |
| 59 | Bhramana | Malefic | 2 |
| 60 | Indurekhā | Benefic | 1 |