"The 'Year Nine' is an abbreviation of 1269 A.H. The beginning of the Year
Nine occurred about two months after His (Baha'u'llah's) imprisonment in
that dungeon. We do not know the exact time He received this first
intimation... We therefore regard the entire Year Nine as a Holy Year, and
the emphasis should be placed ... on the entire year, which started in
October, 1852. This means our Centenary Year of Celebration will be from
October, 1952 to October, 1953."