Think of it this way: when something glows, it emits light and warmth. When that glow is over, it has already happened, and we use the past tense to talk about it. So, if you were to say "the sun glowed yesterday," that sentence would be in the past tense because it already happened.
It might be helpful to remember that regular verbs, like "glow" often form their past tense by simply adding "-ed" at the end of the base verb.
I hope that helps! Let me know if you have any other questions.
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