Earth's time zones – the International Date Line and day length

GeographyEarth in SpaceAges 15–16

A hand-drawn world map splits into 24 time zones (15° of longitude each), with the 0° prime meridian and the 180° International Date Line marked. Drag the Sun across the map or press Run to let time pass: the night region shifts and the time and date of several cities (London, Bangkok, Tokyo, New York, Sydney, Moscow) update live. Drag the observer point anywhere to read off its time zone, local time, sunrise and sunset, and day length for that latitude and day of the year.