tiny, boundless
渺 centers on vast, indistinct expanses that make individual things seem tiny or boundless. The two given meanings are connected by the idea of something so immense or distant that it appears small and without clear limits.
渺 combines 氵 (water) with 眇, which likely contributes both sound and the idea of something distant or indistinct. The overall sense is of a vast, hazy body of water where things appear tiny and boundless.
Water 氵 stretches to the horizon, and the right side 眇 suggests something barely visible in the distance. Picture a tiny boat on a boundless ocean, so small it is almost lost.
For ビョウ, imagine a tiny, boundless misty lake where a single beautiful 秒 (びょう) passes like an eternity: 秒 -> ビョウ, and the vast water makes time feel tiny.