Feast of Trumpets

The Rabbi argued with the other Rabbi,
"The observed calendar places Trumpets as starting September 8th at sundown and the first day runs to sundown September 9th. The next day is also observed by Judaism in case the 9th was declared in error by being too early. However, there are also those who hold to the first observable sliver of the moon as the first of the month. There is a remote possibility of it being viewed on September 9th at evening, but is more likely to be seen on September 10th, making September 11th the Feast of Trumpets according to this view.

When the moon is at conjunction it will be 1030 Universal Time (1230 Jerusalem Time) on September 8, 2010.
1236 Jerusalem Time is real noon on September 8th and 9th.
Jerusalem sunrise is 0618 on September 8th.

Jerusalem sunset is 1855 on September 8th.
Jerusalem sunrise is 0619 on September 9th.

Jerusalem sunset is 1853 on September 9th."
http://en.wikipedia.org/wiki/Rosh_Hashanah