TWO years ago while walking down Parliament Street in York on a bright showery afternoon I witnessed the spectacular sight of a flat circular rainbow, rather like a halo hovering over the city.

I am asking if there are others who also witnessed this rather special event and, indeed, if anyone managed to take a photograph.

Apparently there are such phenomena, but circular rainbows are very rare indeed.

The scientist and TV presenter Adam Hart-Davis is extremely interested in this sighting and asks that anyone who might have done so, to contact me at the address below, I will then pass on the information to him.

Mr A E Eaton,

50 Turker Lane,

Northallerton,

North Yorkshire,

DL6 1QA.

Updated: 10:11 Thursday, February 02, 2006