The Aviv moon of 2012 was observed after sundown on March 23, at 9.87 degrees of elevation, and 1.1% of illumination.
There is some question about the date of the first of Nisan in 2012. The Rabbis have chosen the Metonic cycle
shalom b'SHEM Yah'shua HaMashiach
It doesn’t matter one whit what the Rabbis choose!
Yeshua rejected them totally.
Yehova’s days and years go according to his word.
I do not wish to denigrate the meticulous record keeping of the Rabbis, or their mathematical prowess, but they openly disregard Yehova’s word.