Here's how NORAD Santa Tracker came to be.
Each festive season the air forces tasked with defending US airspace instead devote themselves to tracking Father Christmas.
The North American Aerospace Defense Command - or NORAD - started tracking him when a 1955 advert encouraged children to phone Santa - but gave the wrong number.
When he realised what had happened, Colonel Harry Shoup - who came to be known as the “Santa Colonel” - quickly told his staff to answer the calls with an update on Father Christmas's current position.
And the practice has continued ever since, developing into a tradition where volunteers staff call centres on Christmas Eve and field around 70,000 phone calls each year from 200 countries.
But the tracker has adapted with the times, becoming more advanced through the years as it took to the internet.
It now has its own Twitter, Facebook and YouTube accounts, and not only counts down the days until Father Christmas will begin delivering presents but lets you visit the digital North Pole and play various games.
Now Christmas Eve has arrived, the site will monitor Father Christmas and the reindeers' whereabouts on a map and keep a running tally of the number of gifts delivered.
Last year NORAD's site was optimised for touchscreen devices and is using 3D technology with WebGL to provide a "more realistic-looking version of Santa’s Village and Santa’s trek across the world".
The then deputy commander of NORAD Lt. Gen. Marcel Duval said in 2010: "It's really ingrained in the NORAD psyche and culture.
"It's a goodwill gesture from all of us, on our time off, to all the kids on the planet."
But NORAD are not the only people keeping an eye St Nick's movements today - Google are also giving it a go with their own Google Santa Tracker.
Offering an answer to the question "where is Santa Claus now?", the search giant's bit of kit has been up and running since 2004.
It even partnered with NORAD for a few years, but since 2012 has run its own tracker using Google Maps, giving Santa fans young and old the chance to learn something about the places he visits along the way.