I just want to make sure everyone knows, but from biblical perspective Rosh Hashanah starts when you see the first sliver of the new moon. KaraiteKorner.com (Modern day Sadducees that adhere to strict direct interpretation of old testament scripture) has the Feast of Trumpets starting on sundown Sept. 10th to Sept. 11th sundown. That is when the first sliver of the moon is suppose to be sighted in Israel according to lag time and percent of illumination of 7% (you need at least 3% to see it with the naked eye). Now, there will be people still searching for the moon in Israel on the 9th, but it is expected on the 10th. Also, they have a place where you can sign up to receive new moon reports as soon as they see them over there. I've done that for about 7 or eight years and though the email comes a little late sometimes, it still adds excitement when I see it on Rosh Hashanah.
Also, note that if the scenario of Trumpets starting on the 10th pans out, then Trumpets will also be on Shabbat (or Sabbath) which is Saturday.