夏の大三角形

夜空を見上げて、わし座のアルタイル、こと座のベガ、ハクチョウ座のデネブを線で結んで三角形を作ろう！

Date of Publication

08/14/2020

Contents of Posted Entry (Contest and Theme):

Signed-up Contest Course:

自由研究作品コース

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akyu

（Sixth-Year Student of Elementary School）

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Violation Reporting