In reply to H LV's message of Wed, 26 Feb 2020 14:57:52 -0500: Hi Harry, [snip] A frame of reference is exactly that. It's a mathematical construct. Choose any frame you like, and stick to it, and the math will all work out. Difficulties only arise when we, sometimes sub-consciously, change our frame of reference. Regards,
Robin van Spaandonk local asymmetry = temporary success
