It usually depends on whether I had espresso or matcha that morning. In all seriousness, these motions are not physically detectable by your or my inner ear or other bodily senses. If they were, there wouldn't have been such a massive battle about them over the ages. It's a triumph of the abstraction of thought, and making the simplest possible explanation for celestial motions. Sometimes, flat-earthers comment on this channel with various "if I can't see it" or "I can't feet it" arguments. But they are always woefully under-imaginative. They really believe that eye-witness accounts are the Most Reliable Explanations, but they forget the "Monkey walks through a room of people throwing balls" experiment. Your eyes can be easily deceived, and that's only because of how we look for things due to 65 million years of evolution. Anyway, on a very dark night, when I watch the stars for a long time while at my telescope, I sometimes start to "feel" the motion of the Earth. And that's because I've become so dark adapted and have been standing so still in one place, that the stars' motions become the only thing I can clearly see move. Then, and only then, do you start to feel the wonder of the celestial motions.

@@JasonKendallAstronomer Thanks for your answer, I was angling for some kind of insight into your ability to tune into to those imperceptible motions merely from having them in your conscious cognitive repertoire of forces acting on us. I won't even comment more than this on flat-earthers. If I can ask you another question, do you think we are trapped here on earth and this local vicinity or will we find a way to travel astronomical distances in space someday? And, one more, do you think space is infinite or finite? I am loving your videos, hope you don't mind the questions.

@@user-pw9bh8vw4t I think that one day, if humanity doesn't do itself in with war, or retreating into ignorance, people will at least colonize the Moon and Mars. Getting to the next star will almost certainly be the purview of complex robots. The kind of people who will make interplanetary journeys on one-way trips will be of a singular character. I have no idea what that would be like, but if history informs us at all about it, it might be hyper-religious people longing for freedom of belief, and escaping dominant societal oppression. If that's the type that will willingly and eagerly go, then that's great. If I'm wrong, and it's others, that's great too. I really don't care who does it, where they are from, what they believe. It's that some group should do it, for the sake of all (whether that's their intention or not.) For fun, have you read the Mars Trilogy by Kim Stanley Robinson? He explores such people in great depth and compassion. It's great fiction.

@@JasonKendallAstronomer Thanks Jason. I'm wondering what if anything can be done to extend human life beyond its current miniscule span. Since the distances are beyond comprehension even at lightspeed Earth might collapse in the interim of arrival, if not return. I think our best bet may lie with some kind of quantum entanglement amplifier which supersedes Time and eliminates our need for using our physicality as a vehicle. No, I've not read that, I will look for it. In my own field of specialty making a new type of individual suited to galactic space faring is also of great interest. I am certain such individuals would have to be created through bioengineering if they don't emerge naturally. Thanks a lot for your time Jason, I see how much effort goes into all your videos and just wanted to show my appreciation. I am really enjoying them, thanks!

Yes, but, the universe isn't trillions of years old, so none have become "black dwarfs" yet.

I've remastered it, and you can watch it here: kzbin.info/aero/PLyu4Fovbph6e0oPk9ch3q2II9a8BT8gfL Also, I want to completely re-record it anyway, and that's in the works.

@@JasonKendallAstronomer Wonderful. Thank you for the time and effort you are putting into this content. It's very well written and valuable content. You do a great job writing in a way that appeals to the people who know the science well as well as the people who have never learned about it before. Keep up the incredible work (but only if you want to)

Thanks! Will do!

Bono?

Thanks for the catch! It's more like 225 million years, or a quarter of a billion years.

I knew you knew that, its correct later in the same video. Glad to help. 👍

Please look at the playlist in the description. Thanks!

Glad you enjoyed it