Aitareya Brahmana being a Vedic corpus text and scripture in Hinduism, and the lack of any Mount Meru theories in that text, the medieval era commentators such as Sayana had significant difficulty in reconciling the Vedic era and medieval era cosmographic theories. The medieval era Indian scholars kept the spherical and disc shape cosmography in the Puranas, while the astronomy (Siddhanta) texts for time keeping assumed the spherical assumptions.