Mahayuga has been well described in the Smrities and the Puranas which were for the first time discussed by Brahmagupta in his book which was later on incorporated in modern day Surya Siddhanta. Mahayuga lays a lot of importance to the present day Kali yuga. At the commencement of this it was assumed that the planets went for conjunction for the last time. As this phase is mainly marked buy the evolution of Siddhantas and the study of astronomy altogether, it is important to know the dater of its commencement which is dated somewhere around the midnight of February 17th and 18th, 3102 BC. This yuga highlights the difference between the old version and the new version of the Surya siddhanta which includes the mean calculation of the longitude of the sun, moon and the planets which estimate the year. This yuga also includes the epicycle method to assess the actual planetary location. It includes calculation through the geometrical instruments as well as the calculation done through Vedic mathematics which can assess the accurate location of the sun and its impact on the Earth through calculating the equation of the centre and the equation of the conjunction which can thus assessed. Further Mahayuga provides the rules for calculating the solar and lunar eclipse which were earlier vague and unable to decipher.
Thus, the period known as Mahayuga had been the base of all astronomical innovations of the age which invited the contribution of number of scholars. Beginning with Manu till the modern age every Indian Astronomer contributed to the science of astronomy which passed through different phases in every century. Overall Mahayuga is the only astronomical Siddhanta which describes the chronological growth of the science of Astronomy and its inventions; their impact on the calculation of the calendar and assessment of days as well as months; as well as their impact on modern day science of astronomy which is important to assess the accuracy of astronomy even today.