The Sun does only move about 1.3Mach. So while true - how true fidelity to the actual Concorde is Concorde sim? I haven’t looked if I can download it from the content manager or if it’s a mod addon. I’ve been hesitant to get things that are 3rd party because when flying an actual airliner I want the "realest’ systems and performance simulated. I moved from the 747 to A310-300 because of that quirk of mine.
The Darkstar is more interesting to me outside of that scope because it’s like flight-testing a new plane since there’s no real known characteristics.
For instance how is the TAS programmed? I can work that out.
Presumably the Concorde has normal TAS rule-of-thumb simulated and so its cruising altitude figures for a TAS adjustment of about 201knots.
The SR71 also could do it. The sun sets/rises at about