which is has two divisions Parartha (परार्धः) - Purva Parartha which constitutes the first fifty years of Brahma's age and Dvitiya Parartha which make the later fifty years of Brahma's age. | which is has two divisions Parartha (परार्धः) - Purva Parartha which constitutes the first fifty years of Brahma's age and Dvitiya Parartha which make the later fifty years of Brahma's age. |