Sunset or sunrise.
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The sun appears as a semicircle when it is rising or setting on the horizon. This phenomenon is due to the Earth's atmosphere refracting sunlight, causing the sun to appear flattened as it nears the horizon. The sun's shape changes throughout the day as it moves across the sky, but it is only when it is near the horizon that it takes on a semicircular appearance.
A cone
A semicircle.
A semicircle.
A semicircle.
A semicircle is one possible answer.