IIRC the Meridian name came exactly from the Greenwich Mean Time thing and that the sun logo came first and they picked the name and looked it up in a dictionary and happy with what they found it meant.
Well, this is the Collins Dictionary definition of Meridian:
[1. Circle of the earth passing through poles.
2. Imaginary circle in sky passing through celestial poles.
3. Highest point reached by star etc.
3. period reached by star.
5. of meridian.
6. at peak of something.
I remember reading in another dictionary about the face part sometime ago, but I cant remember which one.
Also to try to be different, Meridian called their station "Meridian Broadcasting". Everyone else is ".... Television"
No, the reason they are '....broadcasting' and not '... television' is because they they are a publisher-broadcaster. The same with Central, the production arm got absorbed into Carltons other productions and Central became just a broadcaster.
Well, anyone who's been to the Greenwich Maritime Museum and the Royal Observatory will note that the two things sailors needed to pinpoint their ship's latitude and longitude were the position of the sun and a prime Meridian from which to measure time. Many sextants and sundials would have decorative faces showing suns, moons, angels, etc. and of course the sun would invariably have a face on it.