[…] When he gives this talk in person, he uses an application called Stellarium to demonstrate the night sky, and some scripts that he wrote that show the rotation and location of the celestial bodies at the time of Jesus’ birth in the city of Bethlehem. You can find links to download his presentation, Stellarium (which is open source and free for all desktop operating systems) and his scripts on his blog: bartbusschots.ie/s/2015/12/01/christmas-star-astro2-december-2015/ …