For the first time, millions of viewers around the world can watch an eclipse of the Sun as it happens
Patrick Moore is in the studio to comment as NBC TV cameras at an observation base in a remote Mexican mountain village transmit colour pictures by satellite of the Moon creeping across the Sun's face.
The Sun will be totally obscured for three-and-a-half minutes, an unusually long eclipse, during which hundreds of the world's astronomers will carry out unique experiments.
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(The 150th anniversary of the Royal Astronomical Society celebrated on Radio 4: Sunday at 10.10 pm. not Wales)
(Colour)