Because at these times the sunlight passes through more of the lower atmosphere. This absorbs more of the light at the blue end of the spectrum leaving the sun looking redder - or more orange.
The sun appears to rise in the east and set in the west. This is due to the Earth's rotation from west to east.
The reason it is said that the sun appears to rise in the east and set in the west is that it doesn't actually rise or set. From our vantage point, it appears that the sun is moving across the sky when in reality, it is the rotation of our own planet that causes the transition from night to day and so on.
Every natural object in the sky appears to rise in the east and set in the west.
The sun appears to rise latest and set earliest during the winter months, typically around December. This is due to the tilt of the Earth's axis, causing the sun's angle to be lower in the sky and resulting in shorter daylight hours.
In reality it does neither. The movement that we call sunrise and sunset are only apparent movements; they seem to be movements of the sun. This happens because of the true spinning of the earth on its axis.
The earth is spinning, so the sun appears to move across the sky, but it isn't moving at all. We are
Passing by a tree while driving is somewhat similar to the rotation of the Earth around the sun in that when you are in the car you are in motion and the tree is still, though the tree appears to be moving closer. The sun appears to rise and set, but in reality it remains still and and the Earth is the moving vehicle.
Rotation detemines the length of a day. When viewed from earth the sun appears to rise and set, however the earth is infact rotating around a central axis while the sun remains relatively still.
The Sun appears to rise and set because the EARTH rotates; the Sun just stays where it is.
The Sun appears to rise in the east and set in the west due to the rotation of Earth on its axis from west to east. As Earth spins, different parts of the planet receive sunlight, causing the Sun to appear to move across the sky. This motion gives the illusion of the Sun rising in the east and setting in the west.
Venus rotation about its axis, in which the sun appears to rise in the west and set in the east, is called a retrograde rotation.
Nothing seen in the sky from a point on the Equator is "circumpolar", meaning that everything in the sky appears to rise and set.