Create the solar analemma curve for a specific location on Earth.

Input parameters:

1. Sk → A sphere representing the dome of the sky. The sphere's x-axis points to the East, while the y-axis points to the North.
2. Yr → Year for analemma curve.
3. Tm → Time of day.
4. La → Latitude of position.
5. Lo → Longitude of position.

Output parameters:

1. An → Analemma polyline containing as many vertices as there are days in the given year.