I've been using the excellent satellite earth image server at http://www.fourmilab.ch as a non-verbal gestalt sundial.	Display: Map From Sun From Moon Night side Coordinates Latitude: North South Longitude: East East Altitude: km Image: Living Earth® Topo map Clouds IR clouds Colour weather Image size: pixels No night	One glance gives one a whole sense of planetary time of day without thinking in terms of time zones, numbers, nations or words.