Moving Directional Light in Sunpath

I am trying to create a 3D sunpath over my model in Unity (and Vuforia). The following image may help understand what I am trying to create.


I am using SketchUp for my main model and Blender for the sunpath model. The VI Suite addon for Blender can create a working sunpath model for any location, time and date. Here is a video showing what I want to achieve in Unity -

Also, Andrew Marsh has a wonderful web-app demonstrating exactly what I am trying to achieve - http://andrewmarsh.com/apps/staging/sunpath3d.html.

This is what I have till now.



I have attached the Directional Light to the yellow sphere to act as the sun. How can I move and rotate the Directional Light so that it travels along the red lines of the sunpath while facing the center of the model(0,0,0)? Are there any plugins/assets (preferably free) that can help in what I am trying to achieve? I am fairly new to Unity so anything in detail would help.

 

DOTween has a DOPath script that can follow along a path.