TOKYO (Reuters) - Japan’s Emperor Akihito prayed to a Shinto sun goddess on Tuesday, starting a day of ceremonies to mark the end of a three-decade reign in which he sought to ease painful memories of World War Two and bring the monarchy closer to people. Japan's Emperor Akihito walks for a ritual called Taiirei-Tojitsu-Kashikodokoro-Omae-no-gi,…