[OpenLayers-Dev] Day and night shadow map

[Fixdit]

Hello, 
I'm in need of help finding/building a day and night layer overlaid on top
of an Openlayers world map. Much like this Google Map example:
http://www.daylightmap.com/index.php

How would this be achieved using Openlayers? 
I have some algorithm examples that could kick start things if there is
nothing already out there, but unsure of where to start implementing
something like this with Openlayers: 
http://www.astro.uu.nl/~strous/AA/en/antwoorden/zonpositie.html#v526

Many thanks in advance, 

Sam

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