Well, there is a star who could actually answer that: our Sun! As seen from the surface of the Earth, the position of the Sun in the sky changes with seasons. The reason for this is that our planet’s rotational axis has a 23˚ inclination with relation to the ecliptic (the plane on which all planets revolve around the Sun) plus the Earth’s orbit around the Sun is an ellipse, not a circle. This practically means that at exactly the same time, the Sun will be at a slightly different place in the sky next Monday as compared to this one. If you take a snapshot of all the Sun’s positions at the same moment over a year, this is called an “analemma”. Now the difference between the analemma and your own “graph of location at 16:00 on Mondays” is that the Sun is far more predictable! It follows the same path in the sky with no deviation year after year. This pattern looks like the figure 8, only it’s tilted and one of its lobes appears larger than the other.

Nice post ..