Frum neighborhoods are announcing that there is an error in the luach of R Nissan Aaron Tukitzinsky, the primary luach used to determined davening times.
The luach says that the shofar may be sounded on motzei Yom Kippur at 5:43pm, when in actuality, it is intended to be 5:53pm, 21 minutes after shkiah.
(Yechiel Spira YWN Israel)