Shining
The sun calls out to the earth by shining down on it.
The sun doesn't have a voice, unfortunately, so it calls out the only way it can, with its shining rays.
しょう
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This shining is aimed directly at the Shougun (しょう). The sun is shining on the Shougun to not only show its support for his leadership, but to let him shine brighter than anyone else in Japan.
Picture the Shougun standing in the shining sunlight. He's so bright and beautiful!