134 that sum amounts to 13°20', the third yoga (called Ayusman) begins when that sum amounts to 26°40', and so on.¹ The remaining chapter relates to the planets, Mars, Mercury, Jupiter, Venus, and Saturn. TRUE LONGITUDE OF A PLANET Calculations relating to the planets, Mars, etc.: 37. (In the case of the planets, Mars, etc.) the determina- tion of the direct and inverse Rsines (relating to the kendra, i.e., mandakendra and sighrakendra) as also the calculation of the bhuja and koti etc. is to be made as in the case of the Sun. The differences (in the case of Mars, etc.) will now be stated. The mandakendra and the sighrakendra are defined by the following equations: ● mandakendra = longitude of the mean planet -- longitude of the planet's mandocca (apogee). śighrakendra longitude of the planet's fighrocca-longitude of the true- mean planet.² - A rule for finding the (planet's) corrected epicycle: 38-39(i). Multiply the Rsine or Rversed-sine (of the part of the kendra lying in the current quadrant³), according as the (current) quadrant is odd or even, by the difference between ¹ The names of the 27 yogas are: (1) Viskambha, (2) Priti, (3) Ayuṣmān, (4) Saubhagya, (5) Sobhana, (6) Atiganda, (7) Sukarmā, (8) Dhrti, (9) Śūla, (10) Ganda, (11) Vṛddhi, (12) Dhruva, (13) Vyāghāta, (14) Harṣaṇa, (15) Vajra, (16) Siddhi, (17) Vyatipāta, (18) Variyan, (19) Parigha, (20) Śiva, (21) Siddha, (22) Sadhya, (23) Subha, (24) Sukla, (25) Brahmā, (26) Indra, and (27) Vaidhṛta. There is another system of twenty-eight yogas, beginning with Ananda. In some Hindu calendars yogas of this system are also given for each day of the month. But these yogas are only of astrological interest. 2 See infra, chapter vii, stanza 12. 3 The kendra is said to be in the first quadrant if it is less than 90°, in the second quadrant if it is between 90° and 180°, and so on. ..
