Earth-Sun eliptical orbit?Sun is located on focus at front or of tail end of its forward motion ?

Answer 1

The sun is indeed located at the focus of the elipse :-) That's why orbital mechanics work! If you think about it, a perfectly circular orbit would simply be a special case of an elipse; since those rarely occur naturally, the only way two bodies can continue to orbit is if one of them is at the focus of the elipse.

Answer 2

i don't understand what the difference is between the front end and tail end, but i know the earth, like all the planets, goes counterclockwise around the sun - if you're looking down from the north pole. (source 1)

if you are looking down on the solar system from the north pole, and put the two foci of the ellipse the earth traces out around the sun on a horizontal line, you could be looking at it from either the direction that the sun would be at the focus on the left or the focus on the right. (draw a little picture then turn it 180 degrees to see what i mean).

the second source i list has a diagram at the bottom of the page to illustrate this (last picture on the page). imagine the picture turned upside down and you will understand what it means to say that the sun is at the focus "at the front end" of the earth's forward motion (if that means "at the beginning") ONLY if we start measuring at january third - which is an arbitrary distinction. we could just as easily say that, at july 4, the sun is at the focus at the tail end of the earth's forward motion.

get it?
:)

Answer 3

The Sun is located at one focus of the ellipse, but it makes no sense to say which focus. When the Earth is nearest the Sun (a point called perihelion), Earth is moving at its fastest point in its orbit. When the Earth is farthest from the Sun (a point called aphelion), Earth is moving at its slowest point in the orbit.

Currently, perihelion occurs during the first week in January and aphelion occurs in early July.

Answer 4

Black spots on sun reveal different picture....Upper atmosphere on fire from inner mass producing highly combustion gas to fuel upper atmosphere.( Mass ejection )