There’s nothing more exciting on Christmas Eve than seeing exactly where Santa Claus and his reindeer are on their nightly journey as he delivers presents around the globe.

For decades, children have been able to track down the location of the man in red by reporting to the North American Aerospace Defense Command, also known as NORAD.

The tradition began in 1955 when a child accidentally called a military commando in Colorado and asked to speak to Santa Claus after a department store ad with a misprinted phone number ran in a local newspaper.

Luckily, Air Force Commander Harry Shoup, who was manning the phones on Christmas Eve, quickly realized the mistake and assured the children that he was indeed Santa Claus.

As more calls came in that night, Commander Shoup assigned a duty officer to continue answering telephone calls. In doing so, he started a tradition that was carried over when NORAD was founded in 1958. The organization has recruited volunteers over the years to specifically handle the incoming phone calls that come in on Christmas Eve.

NORAD also has an online tracker that allows children to watch Santa Claus travel around the world in real time. This year’s website launched on December 1st and currently features a village at the North Pole and a countdown to Christmas Eve. On Christmas Eve, the website will display Santa’s location from 6 a.m. to 2 a.m. ET on Christmas Day.

Families can also download NORAD’s Santa Tracker app from the Apple App Store and Google Play Store. Anyone wishing to call NORAD can call 1-877-HI-NORAD (1-877-446-6723) on December 24th from 8 a.m. to 2 a.m. Christmas Day ET.

Google will also have its own version of a Santa Claus tracker, which will go live on December 24th. Similar to NORAD’s tracker, Google has a countdown timer to Christmas Eve and various games that can be played before Santa’s card goes live.

NORAD’s website previously said its fighter jets had “intercepted Santa Claus many, many times” over the past 65 years, adding: “When the jets intercept Santa Claus, they tilt their wings to say, ‘ Hello Santa Claus’. Norad is following you again this year.’ Santa is always waving.”

According to Norad, the “only logical conclusion” as to how Santa Claus can circumnavigate the globe in one night is that he “somehow functions within his own time-space continuum.”

“NORAD intelligence reports indicate that Santa Claus does not experience time the same way we do. To us, his journey seems to take 24 hours, but for Santa Claus it can take days, weeks or even months,” the agency explained.