Obviously on 13 October 1792, Sirius was rising at midnight, which is one of the three points that some masons mark the day, the others are sunset and sunrise.
However in 1792 everyone was using local time, in 1884 in Washington D.C., time zones were agreed which effected the day that Sirius would rise in the City at midnight, as the Prime Meridian was agreed to be Greenwich U.K.
Also time zones means that huge chunks of the Earth have the same time, which didn't happen before, so by 1911 Sirius wasn't anywhere rising in Washington D.C. on 13th October as with the White House.
Link to the House of the Temple below:-
House of the Temple - Wikipedia, the free encyclopedia