In any normal year, north Texas Autumn leaves develop in late October to mid-November. Last Fall 2006, the Autumn colors did not develop correctly. 

One tree which has always had deeply colored red and orange leaves in the Fall, failed to change colors last Autumn. Nor did it drop the leaves. During Mid-winter, the leaves eventually turned brown, but still failed to fall from the tree. Only when the trees began to bud in early February, did the old leaves finally drop off. While this was odd behavior for that particular tree, by itself, it would not have been substantial reason to suspect the axis was abnormal

In May, 2007, that same tree started changing to Autumn colors. In June, several trees started changing to Fall colors. This was another indication that something was wrong. The trees had gone into photoprotective modes due to the abnormality of the sunlight they received during these months. This is a significant sign that the position of the sun has changed.

Autumn leaves in June 2007 

north Texas

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Crepe Myrtle Flowers on Left

Autumn leaves in tree on right