It says on the about page it is updated every three hours. http://earth.nullschool.net/about.html http://earth.nullschool.net/about.html EDIT: If you click on

It says on the about page it is updated every three hours. http://earth.nullschool.net/about.html http://earth.nullschool.net/about.html EDIT: If you click on 'Earth' it brings up a menu with time controls.