Very occaisonally you may see a phenomenon known as a ‘sun pillar.’ This appears as a colomn of either red or white light light extending vertically above and below the sun, and this is crossedby a similar horizontal bar. When it forms a complete cross in this manner, it is called the ‘heavenly cross.’A sun pillar is caused by the reflection of the sun’s rays on the vertical sides of columnar crystals in the atmosphere. Under similar conditions a ‘moon pillar’ is occasionally seen.

Weather by Reginald M Lester F.R.Met.Soc.