It’s officially the big day for Santa and his reindeer.

Santa will make his Christmas rounds around the world tonight and the North American Defense Command – better known as NORAD- tracks the Jolly Old Elf so that good girls and boys know when it’s time to get to bed.

NORAD started tracking Santa at 5 a.m. CST on Dec. 24. Their official tracking station is armed with hundreds of volunteers who can answer questions on his whereabouts or you can see the tracker below.

You can call 1 877 HI-NORAD (1-877-446-6723) to talk directly to a NORAD staff member who will be able to tell you Santa’s exact location. Operators are available until midnight.

You can also send an email to [email protected]. You can also track Santa on your mobile phone at https://www.noradsanta.org/en/

You can see more of Santa’s journey and what is going on at the North Pole at www.noradsanta.org.

NORAD typically receives more than 111,000 calls from 200 countries on Christmas Eve and answers some 12,000 emails. Corporate sponsors foot the bill for the Santa Tracker and no tax dollars are used in the program.

When will Santa be at my house on Christmas?

According to NORAD, Santa usually starts his journey at the International Date Line in the Pacific Ocean and travels west, visiting the South Pacific first then New Zealand and Australia. After that, he shoots up to Japan, over to Asia then onto western Europe, Canada, the United States and Mexico and Central and South America.

“Keep in mind, Santa’s route can be affected by the weather, so it’s really unpredictable. NORAD coordinates with Santa’s Elf Launch Staff to confirm his launch time but from that point on, Santa calls the shots. We just track him!” NORAD said.

NORAD officials said while the exact time is unknown it appears Santa arrives only when children are asleep, generally between 9 p.m. and midnight local time.

As for how Santa manages to visit every child a night, NORAD has a scientific explanation:

“NORAD intelligence reports indicate that Santa does not experience time the way we do. His trip seems to take 24 hours to us, but to Santa it might last days, weeks or even months. Santa would not want to rush the important job of delivering presents to children and spreading joy to everyone, so the only logical conclusion is that Santa somehow functions within his own time-space continuum,” they explained.

You can track Santa with NORAD below.