Is a Russian soft sign needed in «солнеч…ный день»?

Question

Rule: the Russian letter combination ЧН is written without a soft sign. Complete солнеч…ный день (“a sunny day”) and briefly explain the spelling.

Explanation

In солнечный, the combination чн is written without ь. The softness of ч does not need an additional soft sign.

The ellipsis does not necessarily mean a letter is missing: the correct word is солнечный.