In an effort to add a little more color and beauty into the world, every week on Pinterest I pick one of my favorite things and create a a new board to house all the images I find. On Tuesdays I make a blog post devoted to the theme.
Yesterday was the Autumnal Equinox. The word equinox comes from the Latin words for “equal night.” At the fall and spring equinoxes the hours of daylight are equal to the hour of darkness. This happens because the Sun crosses the celestial equator. Autumn is a time of change as leaves change color, days grow shorter and temperature begin to drop.
Why do leaves change color? The bright pigments carotene (yellow) and anthocyanin (red) you see so vividly during the fall are actually present all year. They are simple masked by chlorophyll (green). When the temperature starts dropping, a barrier forms between the twigs of trees and the leaves preventing sugars from exiting and nutrients from entering the leaves. This results in the chlorophyll breaking down, leaving behind these other pigments.
Have a terrific Tuesday!