There are only so many ways to represent a sphere to suggest 3-dimensionality. Two or three segments are inadequate. Four segments is still too stark. Five segments is not what we are used to. Six segments is good, looks 3D, and fits into the long-standing tendency toward duodecimal numbering. Thousands of years ago, no one understood that Saturn was even a planet, much less the sixth planet. We didn't know that until probably the 15th century (Copernicus).
There are only so many ways to represent a sphere to suggest 3-dimensionality. Two or three segments are inadequate. Four segments is still too stark. Five segments is not what we are used to. Six segments is good, looks 3D, and fits into the long-standing tendency toward duodecimal numbering. Thousands of years ago, no one understood that Saturn was even a planet, much less the sixth planet. We didn't know that until probably the 15th century (Copernicus).
It clearly symbolizes EARTH.