5 ms·

I don't think this is true. General relativity says that time slows down under greater gravitational forces. This has been experimentally proven. Therefore c

by danans 5y ago

I don't think this is true. General relativity says that time slows down under greater gravitational forces. This has been experimentally proven. Therefore clocks at different elevations run at different speeds.

charcircuit 5y ago
>Therefore clocks at different elevations run at different speeds. If clock A runs at 1x speed and clock B runs at 2x speed. Now will refer to time t for clock A and t / 2 for clock B.
- danans 5y ago
  You can refer to it differently, but time progresses at different rates at the different places. So in your example, physical processes (i.e rusting, aging) at place B happen 2X as fast as those at place A.
  - charcircuit 5y ago
    >but time progresses at different rates at the different places. What's the problem? We can still have a now defined as I mentioned above. t1=t2=0 at the start. Now when t1=x for place A will refer to when t2=2*t1 at place B.
    - random314 5y ago
      As per Einstein's theory of relativity, there is no universal now https://en.wikipedia.org/wiki/Relativity_of_simultaneity https://en.wikipedia.org/wiki/Relativity_of_simultaneity Also, from https://en.wikipedia.org/wiki/Spacetime https://en.wikipedia.org/wiki/Spacetime "the distances and even temporal ordering of pairs of events change when measured in different inertial frames of reference (this is the relativity of simultaneity); and the linear additivity of velocities no longer holds true."
      - charcircuit 5y ago
        >the distances and even temporal ordering of pairs of events change when measured in different inertial frames of reference (this is the relativity of simultaneity) I'm not saying to use different frames of reference. I am saying to use a single universal frame of reference.
        random314 5y ago
        There is a frame of reference where the merger hasn't happened yet. Let's use that as a universal frame of reference.
dreamcompiler 5y ago
Yes. In addition, Special relativity says clocks moving faster through space tick slower than clocks that move more slowly. So let's say you're a GPS satellite. GR says your clock ticks too fast because you're farther from the center of the earth's gravity well than the wristwatches of people on the surface. But SR says your clock ticks slower than a wristwatch on the surface because you're whizzing through space at ~15,000 km/hour. Which is right? Both. And they do not exactly cancel each other out (in general). So both GR and SR have to be taken into account to make GPS satellites produce accurate locations and times.

by danans 5y ago

charcircuit 5y ago

>Therefore clocks at different elevations run at different speeds. If clock A runs at 1x speed and clock B runs at 2x speed. Now will refer to time t for clock A and t / 2 for clock B.

danans 5y ago
You can refer to it differently, but time progresses at different rates at the different places. So in your example, physical processes (i.e rusting, aging) at place B happen 2X as fast as those at place A.
- charcircuit 5y ago
  >but time progresses at different rates at the different places. What's the problem? We can still have a now defined as I mentioned above. t1=t2=0 at the start. Now when t1=x for place A will refer to when t2=2*t1 at place B.
  - random314 5y ago
    As per Einstein's theory of relativity, there is no universal now https://en.wikipedia.org/wiki/Relativity_of_simultaneity https://en.wikipedia.org/wiki/Relativity_of_simultaneity Also, from https://en.wikipedia.org/wiki/Spacetime https://en.wikipedia.org/wiki/Spacetime "the distances and even temporal ordering of pairs of events change when measured in different inertial frames of reference (this is the relativity of simultaneity); and the linear additivity of velocities no longer holds true."
    - charcircuit 5y ago
      >the distances and even temporal ordering of pairs of events change when measured in different inertial frames of reference (this is the relativity of simultaneity) I'm not saying to use different frames of reference. I am saying to use a single universal frame of reference.
      - random314 5y ago
        There is a frame of reference where the merger hasn't happened yet. Let's use that as a universal frame of reference.

dreamcompiler 5y ago

Yes. In addition, Special relativity says clocks moving faster through space tick slower than clocks that move more slowly. So let's say you're a GPS satellite. GR says your clock ticks too fast because you're farther from the center of the earth's gravity well than the wristwatches of people on the surface. But SR says your clock ticks slower than a wristwatch on the surface because you're whizzing through space at ~15,000 km/hour. Which is right? Both. And they do not exactly cancel each other out (in general). So both GR and SR have to be taken into account to make GPS satellites produce accurate locations and times.