Sometimes, we forget, not the content of what we wish to express but what we want to say exactly. An envelope has another definition. In mathematics, it refers to a line, a curve, or a surface and volume that are tangent to a series of lines, curves, or surfaces and volumes. Several points of your DNA can be tangent to a cylinder. All the circles of your tires of your bicycle or car are tangent to the street surface. Mathematicians describe it as a convolution: the multiplication of two function. Take, please, two simple function x-1 and x+1. The result is y= x to power of two -1. A hyperbolic curve. What usually we see on the sun. I sent the fallowing text for Christmas and New Year greeting to my friends: In my last article I told you about all planets in our sky above us. The sun was almost the last and furthest object between them. Except Pluto and Neptune that were behind the Sun. These planets and moon made a great gravity on the Sun too. You could see on the recent picture of the sun an overlap like the overlap of the Christmas envelope. Attached, please, find some pictures of the sun, one in Word 2003 and another in Word Docx. Merry Christmas and happy New Year to all Christians. A year plenty of joy, prosperity, and peace. The envelope I refer in above mentioned text is nearly a hyperbolic curve. Something like y= x2- 1. But you can find in mathematics literature, a line of fixed length in a coordinate of, for example, positive x and y can move and you can find a curve tangent to it like the curve of y= 1/x. Suppose from center of the sun or a core, a point having small width emits some energy. As it arrives to the surface, we have a larger area over the sun. We will have lines of radiation that might form a curve of the shape of y= 1/x. If two points near each other are emitting energy over a core, we will have a hyperbolic curve. I know there are magnetic interpretation of sun surface and flare,…but maybe good to mention it.