This year the Jewish holiday Rosh Hashanah has arrived on Monday and people all over the world are celebrating.

In Hebrew, the holiday literally means "Head of the Year" and is the first of the High Holy Days. It officially kicked off at sundown on Sunday and Jews will celebrate until nightfall on Sept. 18.

It is considered the new year of people, animals, and legal contracts, and according to Jewish oral tradition, and Rosh Hashanah marks the completion of the creation of the world.

Customs surrounding the holiday include sounding the traditional Jewish horn, the shofar, and eating symbolic foods such as apples dipped in honey.

Many schools are closed as Jews celebrate their 5773rd calendar year on Monday.

Not just Jews are celebrating Rosh Hashanah though; Christians and members of many different churches can observe the autumn event.

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Rosh Hashanah became a trending topic on Twitter Monday with thousands of people posting well wishes about the holiday.

"Happy Rosh Hashanah everybody," wrote Jeff, while Ed posted, "Good wishes to Jews throughout the country as we approach Rosh Hashanah."

The president of the United States issued a greeting on Rosh Hashanah last night as people all over the world celebrate the start of a new year.

"This is a joyful time for millions of people around the world, but Rosh Hashanah and Yom Kippur are also opportunities for reflection," said President Obama. "They represent a chance to take stock of our lives and look forward to the coming year with clear eyes and renewed purpose."

Obama noted that the Jewish tradition reminds us about forgiveness and of the importance of making amends.

"I hope that Americans of all faiths can take this opportunity to reach out to those who are less fortunate; to be tolerant of our neighbors; and to recognize ourselves in one another," said the president.

"In that spirit, Michelle and I wish you and your families a sweet year full of health, happiness, and peace," he added. "L'Shana Tovah."