"The daily obligatory prayers are three in number...."
"The daily obligatory prayers are three in number. ... The believer is
entirely free to choose any one of these three prayers, but is under the
obligation of reciting one of them, and in accordance with any specific
directions with which they may be accompanied."
--from a letter written on behalf of Shoghi Effendi
"By 'morning,' 'noon' and 'evening,' mentioned in connection with the
Obligatory Prayers, is meant respectively the intervals between sunrise
and noon, between noon and sunset, and from sunset till two hours after
sunset."--Synopsis and Codification of the Kitab-i-Aqdas, p. 36