if you could record the position of the sun in the sky at the same time every day, you would notice that the sun takes a rather strange path. At certain times the sun's position not only varies higher and lower (North and South) as you would expect with the change of the seasons, but also slightly east and west. There is a difference in time between what your watch reads and the position of the sun.
There are two reasons and they are completely independent from each other.
1. The Earth is tilted on its axis 23.5° in relation to the plane of its orbit around the sun.
2. The Earth does not orbit the sun in a circle, but in an ellipse.
According to this correction, an analematic sundial will mark clock time instead of solar time
Calculate and draw your analemma
Your own shadow will show what time it is.
This analemmatic sundial in made in Carrara marble, the most famous marble of the world