From the website:
Eternal Sunset endeavours to ensure you can enjoy the sunset live from any location, at any time. As the sunset moves westward, Eternal Sunset continuously tunes into different webcams, chasing the sunset around the globe. This service is currently provided through the use of 257 west-facing webcams across 46 countries.
Eternal Sunset is a virtual space where time is passing but where the daily cycle of day and night has come to a freeze at sunset; a space where the sun is always going down but never goes under. Complementing the increased efficiency and productivity associated with the internet, Eternal Sunset celebrates the romantic beauty enabled by that same technology.
Ever since I discovered Evensong at Christ Church Cathedral, Indianapolis, and then was priveleged to live it four evenings a week while at seminary, I have had a special fondness for the setting sun. Now I can get my sunset fix no matter what time Evensong happens to be!
O gracious light, pure brightness of the everliving Father in heaven; O Jesus Christ. Now as we come to the setting of the sun, and our eyes behond the vesper light, we sing your praises, O God, Father, Son, and Holy Spirit. You are worthy at all times to be praised by happy voices, O Son of God, O Giver of life, and to be glorified through all the worlds.
Here's a nice setting of O Gracious Light (Phos Hilaron) courtesy of Chantblog.