[teraflop]

Cool demo!

I notice that the stars don't seem to be rendered correctly. If you zoom out, you can see the sun's position relative to the stars. As you scroll the date slider through the course of a year, the sun should make a complete 360-degree revolution around the ecliptic. Or, when the camera view is locked to the sun, the stars should appear to revolve relative to the sun.

Instead, the sun appears motionless against the stars, regardless of the time of year. (If the demo used actual star positions, I would be able to point to how the sun was in the wrong constellation for a given date. But the starfield is randomly generated, so you have to actually observe the sun in motion to see the bug.)