At twilight, nature is not without loveliness, though perhaps its chief use is to illustrate quotations from the poets. ~ Oscar Wilde

twi·light   [twahy-lahyt]
noun
1.
the soft, diffused light from the sky when the sun is below the horizon, either from daybreak to sunrise or, more commonly, from sunset to nightfall.
2.
the period in the morning or, more commonly, in the evening during which this light prevails.
3.
a terminal period, especially after full development, success,etc.: the twilight of his life.
4.
a state of uncertainty, vagueness. (gloom)

A beginning ... An ending ... A passage from this to that, from now to something other. A diffused light ... A time to wonder, a time of wonder. The time when the fireflies fly call to their cousins, Sirius, Vega, Rigel, Bellatrix ... light up the heavens.