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From the surface of the following sentences, it is achieved that the meaning of the "glowing" is brilliant but in the dictionaries, it is defined like this:
They may change color with changing light conditions and cloud cover, glowing pink or gold in the morning or evening light.
See https://dictionary.cambridge.org/dictionary/english/glow
to produce a continuous light and sometimes heat
That’s the definition you’re looking for. The present participle of “to glow” is “glowing” and is being used as an adjective here.
