Is the Early Harapan Civilization a Contemporary of the Mahabharata Era?

Currently, how can we say that Earth is tilted when it is in space and no base below it? It is not tilted with respect to up or down. It is tilted like this with respect to the plane of the solar system. I think there was definitely some kind of overlap between the Saraswati Hindu phase of Indian history and the Mahabharata era. We don't know exactly what it was because we don't know the date, exact date or even the millennium in which the MahabHarata happened.