a. Reliance on clocks is permissible in
determining the times for offering the Obligatory
Prayers.
b. In countries situated in the extreme north or
south, where the duration of days and nights
varies considerably, clocks and timepieces should
be relied upon, without reference to sunrise or
sunset.
12. In case of danger, whether when travelling or not,
for every Obligatory Prayer not offered a prostration
and the recital of a specific verse is enjoined, to be
followed by the repetition, eighteen times, of another
specific verse.
13. Congregational prayer is forbidden except the Prayer
for the Dead.
14. The recital, in its entirety, of the Prayer for the
Dead is prescribed except for those unable to read, who
are commanded to repeat the six specific passages in
that Prayer.
15. The Obligatory Prayer to be thrice repeated, three
times a day, at morn, noon and evening, has been
superseded by three Obligatory Prayers subsequently
revealed.
16. The Prayer of the Signs has been annulled, and a
specifically revealed verse substituted for it. The
recital of this verse is not however obligatory.
17. Hair, sable, bones and the like do not nullify one's
prayer.