The story was about people living on another planet (for whatever reason) that was always dark and cold except for one day every 100+ years or so when the sun shone on the planet for only a few hours. It focused specifically on a classroom of children. As the teacher and children prepared to go outside to experience sunlight for the only time in their lives one child was accidentally(?) locked in a closet (broom or cloak) and was left behind. The story told of how everyone had fun outside in the sun, being able to take off their coats and feel the warmth of sunlight, except that one child, who was found crying in the closet when everyone came back inside after it became dark again. This story could also be part of a longer story, I don't know.

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    All Summer in a Day
    – Adamant
    Aug 15, 2016 at 20:41
  • @Adamant - Yup; en.wikipedia.org/wiki/All_Summer_in_a_Day - "Suddenly, a girl catches a raindrop in her hands. Thunder sounds, and they start to cry and run back inside. At this point one of them remembers Margot, who is still locked in the closet. Ashamed, they let her out of the closet, standing frozen, embarrassed over what they have done, and unable to "meet each other's glances." The precious Sun has come and gone and, because of their despicable act, Margot, who loved the Sun the most, has missed it."
    – Valorum
    Aug 15, 2016 at 20:43
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    Ray Bradbury's "All Summer in a Day" has been reprinted many times. If you read it in "a hardbound textbook around 1974–1976", the nearest thing I can find is You and Science Fiction by Bernard C. Hollister, published by National Textbook Co., but that was a trade paperback.
    – user14111
    Aug 15, 2016 at 20:58
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    Yes, this is the story I've been searching for. Sorry it was a Dupe question, though I did search this website before posting my question I wasn't using the correct tags. Thank you, again. Aug 15, 2016 at 21:48
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    @KathyMcNally: No worries. ^_^ It's generally not a censure to have a question closed as a duplicate, especially with story-identification, which is so relative with people remembering different part.
    – FuzzyBoots
    Aug 15, 2016 at 22:41