With the Nebra Sky Disc the stars marked orange in the illustration are particularly conspicuous because they lie approximately in the middle and before the ends of the horizon arcs.
The visible path of the sun or the ecliptic runs through the middle of the zodiac. If we look at the sun the same time every day, it always takes four minutes longer to appear. Because of this delay, we can also observe, every three months at the same time, one of the four extreme positions, the two equinoxes and the solstices,
Rather than relying on the sun, each of these four extreme positions can be recognized much more easily with the help of a bright, almost simultaneously visible pair of stars from two different signs of the zodiac (joined by red linies in the illustration). One star revealed the beginning of the ecliptic in the east and another one revealed the end of the ecliptic in west.
In about 1950 B.C. in Central Germany, always two >ecliptic stars< stood almost exactely above the east and west points at the solstices when the high-level position or low-level position of the ecliptic occurred. During the equinoxes the eastern and western tilt could be observed in each case by a southern and a northern star.
Therefore these pairs of stars symbolise all the extreme positions of the zodiac, which, however, were also to be seen on other nights, but not at dusk.
If the creator of the Nebra Sky Disc wanted to show that five planets struck him by their movements, too, he would probably place them close to the sun and moon since they are always seen in their paths, as well as within the extreme positions of the ecliptic, which are indicated in this drawing by straight lines.
The five golden stars in the middle of the Sky Disc – marked in green – represent the five planets visible to the naked eye. Two golden stars can be seen east of the sun on the edge of the horizon. – This facilitates the visibility of the inner planets, Mercury and Venus. Due to the fact that they orbit the sun in their smaller circuits faster than the Earth, they always stand, even at the farthest distance, in the same quarter of the sky with the sun and in the adjacent signs of the zodiac. Looking from the Earth towards the sun, these stars apparently oscillate only around the sun and in so doing always remain near the horizon.
The three other golden planets have been placed between the sun and the moon, closer to the centre of the disc and therefore higher in the sky. – Since the Earth also belongs to the planets and is the third closest planet to the sun, Mars, Jupiter and Saturn go round the sun beyond the Earth’s orbit in wider radii. As we are able to see the paths of these outer planets >from the inside<, they can never stand between us and the sun. Like the sun and the moon, they follow complete orbits in the whole ecliptic. Thus they can also be found high above the horizon in the south around midnight.
more about this: Die Sterne