 " Day of the Moon " was first broadcast on BBC One on 30 April 2011 at 6 pm and on the same date on BBC America in the United States . Initial overnight ratings showed that the episode had been watched by 5 @.@ 4 million viewers , a decrease of 1 @.@ 1 million from the previous week . The episode received final ratings of 7 @.@ 3 million viewers on BBC One , seventh for the week on that channel . It received an Appreciation Index of 87 , considered " excellent " . 
