To mark the start of the Festival of Lights, the world’s largest menorah will be lit at Grand Army Plaza in Manhattan on Wednesday.

Hanukkah is an eight-day festival marking the rededication of the Temple in Jerusalem. Here's what to know about the celebration.

Christmas Day also marks the beginning of the Jewish holiday Hanukkah - it's the first time in 19 years that both holidays begin at the same time. The eight-day-long festival features the lighting of a Hanukkah menorah every evening to symbolize God's presence.

But did you know that it's also Hanukkah? This year, Hanukkah begins with Christmas on the night of Wednesday, Dec. 25. Because the start of Hanukkah is tied to the Hebrew calendar, the dates change from year to year and the holiday can happen between late November and late December.

While the Jewish holiday of Hanukkah often falls at varying points during November and December, this year's festival of lights begins a bit later - and it comes with a calendar rarity.