Hope the below book will be useful to you. The Holy Science is a book written by Swami Sri Yukteswar Giri under the title Kaivalya Darsanam, it is a Hindi language book. It is written in 1894, so its a very old book of Sri Yukteswar Giri states that he wrote The Holy Science at the request of Mahavatar Babaji, a Guru. The book compares the Bible and Upanishads based on science. It is a book which goes to the deepest point about our belief as per the religions and the scientific version for those beliefs.
In this book, he says as per the Yuga cycle, the present yuga is Dwaparayuga unless most of the Hindu astrologers saying this is "Kaliyuga". As per Swami Sri Yukteswar Giri, we are now in the early days of Dwapara Yuga which started on AD1699 and will go to next yuga which is the Threta yuga in the year AD4099.
He also says the Sun has another type of motion in which it revolves around a place called Vishnu-nabhi, where Brahma sits. In Hindu Mythology, Brahma is the creator of everything and it possesses the Universal Magnetism. Please go through this book which helps many new theories about cycle and periodicity.
You can buy this book online from Amazone which will cost you around Rs.350-400 including shipping charges.
Winners are too busy to be sad,too positive to be doubtful,too optimistic to be fearful and too determined to be defeated.