AN incredible video of a full circle rainbow on the Queensferry Crossing, outside of Edinburgh, has ben shared online.

Reddit user 'interestingasfuck' posted the video of the rare weather phenomenon which quickly caught the internet's attention, rocketing it to the top of Reddit's most popular posts.

Twitter user @CosmossUP then shared the video to Twitter.

In theory, all rainbows are circles, however we can usually only see the top half.

In order to see a full circle there must be water droplets below the observer's horizon, so they must be elevated AND have the sun be in a position that its light can reach them.

The original post can be seen here.