Helium was first detected during the total solar eclipse of August 18, 1868 in parts of India. It was the first eclipse expedition in which a spectroscope was used.
J. Norman Lockyer and Pierre Janssen are honored for their discovery of the nature of the Sun's prominences. They were the first to notice bright spectral emission lines when viewing the limb of the Sun without the aid of a total solar eclipse.
Bahá'u'lláh declares his station as "One who was made Manifest", in the Garden of Ridván, as foretold by the Báb. Bahá'ís see this as the beginning date of the Bahá'í Faith.