It's a holiday all across the world: the Vernal Equinox

Evening 6 of 7 in Vernal Equinox Series
Originally uploaded by Ssimpson13.

Please see equinox - equi, "equal," and nox, "night," - in wikipedia for a sense of its importance.

Evidently only some regions have "equal night and day." The real meaning is that the sun is directly above the equator.

Vernal: what color? Verdantly, he replied, g r e e n.