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When does fall begin?

Fall - Autumn

The equinox brings autumn on September 22, 2013 at 4:44 P.M EDT.

It is the summer's great last heat,

It is the fall's first chill: They meet.

–Sarah Morgan Bryan Piatt

The Autumnal Equinox

The word equinox comes from the Latin words for "equal night." The fall and spring equinoxes are the only days of the year in which the Sun crosses the celestial equator.  From here on out, the temperatures begin to drop and the days start to get shorter than the nights

Fall - rise and set of sun for Sept 22nd 2013

Questions and Answers About Fall…..

Why aren't there exactly 12 hours of daylight and 12 hours of darkness on the fall equinox?

Answer: On the equinoxes, the very center of the Sun sets just 12 hours after it rises. But the day begins when the upper edge of the Sun reaches the horizon (which happens a bit before the center rises), and it doesn't end until the entire Sun has set. Not only that, but the Sun is actually visible when it is below the horizon, as Earth's atmosphere refracts the Sun's rays and bends them in an arc over the horizon. According to our former astronomer, George Greenstein, "If the Sun were to shrink to a starlike point and we lived in a world without air, the spring and fall equinoxes would truly have 'equal nights.'"

Fall - Harvest time

The autumn leaves seems to be hanging on longer than usual in my neck of the woods. Is this an indication of winter weather to come?

Answer: There's an old weather proverb that states, "If autumn leaves are slow to fall, prepare for a cold winter." Or perhaps you just haven't had the kind of wind or rain needed to shake the leaves loose from their branches. But look on the bright side—you get to look at the beautiful autumn foliage for a little bit longer! 

Why do autumn leaves change color

George and Becky Lohmiller write in the Farmer Almanac……

Not all leaves turn vivid colors in the fall. Only a few of our many species of deciduous trees—notably maple, aspen, oak, and gum—produce stellar performances for our annual autumn spectacular in North America.

Several factors contribute to fall color (temperature, precipitation, soil moisture), but the main agent is light, or actually the lack of it. The amount of daylight relates to the timing of the autumnal equinox.

As the autumn days grow shorter, the reduced light triggers chemical changes in deciduous plants causing a corky wall to form between the twig and the leaf stalk.

This "abscission layer" eventually causes the leaf to drop off in the breeze. As the corky cells multiply, they seal off the vessels that supply the leaf with nutrients and water and also block the exit vessels, trapping simple sugars in the leaves. The combination of reduced light, lack of nutrients, and no water add up to the death of the pigment chlorophyll, the "green" in leaves.

Once the green is gone, two other pigments show their bright faces. These pigments, carotene (yellow) and anthocyanin (red), exist in the leaf all summer but are masked by the chlorophyll. (The browns in autumn leaves are the result of tannin, a chemical that exists in many leaves, especially oaks.)

Sugar trapped in autumn leaves by the abscission layer is largely responsible for the vivid color. Some additional anthocyanins are also manufactured by sunlight acting on the trapped sugar. This is why the foliage is so sparkling after several bright fall days and more pastel during rainy spells. In general, a set growing season followed by a dry autumn filled with sunny days and cool, frostless nights produce the most vibrant palette of fall colors.

Of course, if freezing temperatures and a hard frost hits, it can kill the process within the leaf and lead to poor fall color. Also, drought conditions during late summer and early fall can trigger an early “shutdown” of trees as they prepare for winter, causing leaves to fall early from trees without reaching their full color potential.

Fall - decorating

 

 

We hope your Autumn is fantastic!

Jackie Carron Home Selling Team
Keller Williams Neighbourhood Realty Inc. Brokerage
2968 Dundas St W, Suite 303
Toronto, Ontario
M6P 1Y8

phone: 416-712-8840

website link: http://jackiecarron.com/

 

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