The sky shapes like an imperfect sphere with some rock, magma, water, metal, life, etc.
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A shape in the night sky is a star. It could also be a circle if the moon is the shape being referred to.
A geometric star shape is concave. A star that is in the sky is convex.
It looks like a big bright circle in the sky
A rainbow is actually round. On the ground, the bottom part is hidden. In the sky, like from the view of a flying airplane, it can be seen as a round shape. Check the Popsci link for more information.
Sunset or sunrise.