The Japanese flag references the Sun, and it's hard to aim for astrological minimalism and not look similar. Still, the transparent background is a bad idea IMO, because a spaceship/space station with painted flags will look very funny.
Nevertheless, I think the Earth flag should include the moon too. A blue Earth, a white Moon, and a black background. When the Moon secession war starts, the laser holes in the flag could double as the starry sky.
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Nevertheless, I think the Earth flag should include the moon too. A blue Earth, a white Moon, and a black background. When the Moon secession war starts, the laser holes in the flag could double as the starry sky.