Wikipedia:POTD column/August 3, 2006

Seen here from the rear at twilight, the London Eye, also known as the Millennium Wheel, is the largest observation wheel (a type of Ferris wheel) in the world at 135 m (443 ft) high. The wheel carries 32 sealed passenger capsules and rotates at a rate of 0.26 m/s (about 0.9 km/h or 0.6 mph) so that one revolution takes about 30 minutes to complete.