Bharatiya Jyotihshastra (History of Indian Astronomy), translated by R. V. Vaidya v2.c13.s2.9

v2.c13.s2.9

The auspicious or inauspicious nature of nakṣatras in regard to the performance of rites is based on such considerations as the names of nakṣatras and their controlling deities. The horse and other imaginary categories (yoni)** assigned to Aśvinī and other nakṣatras, the imaginary terms cara (movable), sthira (fixed) etc. the animals like ram etc. suggested by names like Meśa (a ram) etc. given to signs, Mars and other lords of signs, Nanda and other names given to the tithis, lords of tithis and similar other things. For example the performance of a rite to ensure ‘fixity’ or stability under the influence of a ‘movable’ nakṣatra is regarded as inauspicious: if the birth nakṣatras of the bride and the bridegroom be Rohiṇī and Uttarāṣāḍhā respectively, then the union would prove unfortunate because these (nakṣatras) are regarded as coming under the categories of snake and mongoose who are natural enemies and so on.