Timeline for Why was Galilei "right"?
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 12, 2013 at 22:14 | comment | added | user4552 | @SebastianHenckel: Right, and the earth rotates as seen in that frame. Note that in GR, we don't have global frames, and we don't have a notion that inertial observers' relative displacements change linearly with time. For example, if I drop a rock in LA and someone else drops a rock in Mumbai, the rocks are both inertial, but their relative displacements don't change linearly with time. Likewise for earth and sun. | |
| Aug 12, 2013 at 21:57 | comment | added | yippy_yay | @Ben Crowell What about a reference frame centered at the center of the earth with one axis always pointing to the north star? That is free falling and non-rotating. | |
| Aug 12, 2013 at 21:46 | comment | added | user4552 | @SebastianHenckel: In GR, an inertial frame has to be both free-falling and non-rotating. | |
| Aug 12, 2013 at 21:24 | comment | added | yippy_yay | But a reference frame attached to the center of the earth is free-falling, and therefore an inertial frame, isn't it? | |
| Aug 12, 2013 at 21:17 | history | answered | Kitchi | CC BY-SA 3.0 |