Sunday, July 24
Jul. 24th, 2022 11:15 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
gottawonderToday I am grateful for:
Decent weather, though it feels heavy and brooding. I feels like it could storm later.
I got a few tiny things done. I re-potted some house plants, and I scrubbed out the big water tub for the ponies/goats. That has to be done every couple of weeks because the algae builds up in it.
I went to see River, and he was in a weird mood. He was perfectly relaxed while in the barn, but we went outside, and he started being very worried about everything. He didn't spook, but his attention was everywhere else. The cows across the road, the kids in the yard beside us, he was worried about everything.
We did some work again on the obstacles, with his head looking at everything else. He DID them, but mentally was somewhere else.
I rode him in the indoor, and same thing.
I even spent some time just sitting with him and letting him relax on the Surefoot pads, and he never really let it all go.
I led him to the pasture, and he was really concerned about something in there, and so were the other horses, so maybe there was some strange animal around again? Who knows.
I sure didn't get much done today. I hate that, because I am always aware of everything that needs doing, and it bothers me even more not to do anything about it.
I learned that GPS satellites are far enough away from earth that time moves slower for them, so they are corrected to compensate for relativity using Einstein's calculations.
The difference is small (the clocks on the satellite are 38 microseconds per day faster than clocks on Earth), but at 38 microseconds different per day, the relativistic offset in the rates of the satellite clocks is so large that, if left uncompensated, it would cause navigational errors that accumulate faster than 10 km per day! GPS accounts for relativity by electronically adjusting the rates of the satellite clocks, and by building mathematical corrections into the computer chips which solve for the user's location. Without the proper application of relativity, GPS would fail in its navigational functions within about 2 minutes.
https://physicscentral.com/explore/writers/will.cfm#:~:text=GPS%20accounts%20for%20relativity%20by,functions%20within%20about%202%20minutes.
Decent weather, though it feels heavy and brooding. I feels like it could storm later.
I got a few tiny things done. I re-potted some house plants, and I scrubbed out the big water tub for the ponies/goats. That has to be done every couple of weeks because the algae builds up in it.
I went to see River, and he was in a weird mood. He was perfectly relaxed while in the barn, but we went outside, and he started being very worried about everything. He didn't spook, but his attention was everywhere else. The cows across the road, the kids in the yard beside us, he was worried about everything.
We did some work again on the obstacles, with his head looking at everything else. He DID them, but mentally was somewhere else.
I rode him in the indoor, and same thing.
I even spent some time just sitting with him and letting him relax on the Surefoot pads, and he never really let it all go.
I led him to the pasture, and he was really concerned about something in there, and so were the other horses, so maybe there was some strange animal around again? Who knows.
I sure didn't get much done today. I hate that, because I am always aware of everything that needs doing, and it bothers me even more not to do anything about it.
I learned that GPS satellites are far enough away from earth that time moves slower for them, so they are corrected to compensate for relativity using Einstein's calculations.
The difference is small (the clocks on the satellite are 38 microseconds per day faster than clocks on Earth), but at 38 microseconds different per day, the relativistic offset in the rates of the satellite clocks is so large that, if left uncompensated, it would cause navigational errors that accumulate faster than 10 km per day! GPS accounts for relativity by electronically adjusting the rates of the satellite clocks, and by building mathematical corrections into the computer chips which solve for the user's location. Without the proper application of relativity, GPS would fail in its navigational functions within about 2 minutes.
https://physicscentral.com/explore/writers/will.cfm#:~:text=GPS%20accounts%20for%20relativity%20by,functions%20within%20about%202%20minutes.
