El sol es amarillo, singular y masculino.
What color is the sun?
The assertion "El sol es amarillo" reflects the visual perception of the sun from the vantage point of Earth.
In Spanish, nouns have grammatical gender, and "sol" (sun) is considered masculine. The gender assignment in Spanish doesn't necessarily reflect the actual gender of the object but rather is a grammatical characteristic. There isn't a definitive or inherent reason why "sol" is masculine; it's simply a part of the language's grammatical structure where certain nouns are classified as masculine or feminine.