• S. Subramanian

Abstract: This paper presents detailed information about the universe which goes through a new Radiation called Cosmic Background Radiation and this can be classified on the basis of the energy photons from higher to lower levels and we calculate the Epoch of each Radiation by using the Dark Constant which is the ratio of X- Energy with Cosmic Background Radiation Energy or it's each Energy Radiation as classified on the basis of the Electromagnetic spectrum. We establish the well relationship between X-Energy & Cosmic Background Radiation Temperature (T) as well as the relation between X-Energy & Ho. Using all these relations we derive the correct value for Ho and the Temperature T of Cosmic Background Radiation (CBR). In this research paper we finally estimate the Epoch of each Radiation of CBR & as well as the exact commence of the Epoch of Reionization (EoR) which was occurred during the early universe at which the Age of the Universe, Tu = 652619.9959 Years or 0.6526 Million years with Ho = 1498287.37413118 Km/s/Mpc after the Big Bang.

Keywords: X-Energy, Dark Constant, Hubble constant, age of the universe, Cosmic Background Radiation, CMB, early universe and late universe, Epoch of Reionization, Helium Reionization.

"The Exact Commence of the Epoch of Reionization", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.11, Issue 12, page no.a680-a689, December-2024, Available :http://www.jetir.org/papers/JETIR2412061.pdf

"The Exact Commence of the Epoch of Reionization", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.11, Issue 12, page no. ppa680-a689, December-2024, Available at : http://www.jetir.org/papers/JETIR2412061.pdf