4 ms·
This is all fine and dandy until the next geomagnetic reversal, at which point we suddenly find everything 180 degrees out of phase.
by hugh3 16y ago
This is all fine and dandy until the next geomagnetic reversal, at which point we suddenly find everything 180 degrees out of phase.
- AndrewDucker 16y agoThankfully, runways are numbered with _both_ numbers. So 18/36 or 9/27. Total reversal would leave the numbers the same...
- rlpb 16y agoEach number labels one direction/end, so they'd still have to be swapped round.
- yogipatel 16y agoNo, they'd still have to be swapped (under the current scheme of runway numbering). If you're landing on runway 18, you know your compass better be reading ~180° (after correction for deviation). Similarly, when taking off from runway 18, your compass should read the same. You can see just how much the magnetic variation changes around the world in this graphic: http://en.wikipedia.org/wiki/File:Earth_Magnetic_Field_Declination_from_1590_to_1990.gif http://en.wikipedia.org/wiki/File:Earth_Magnetic_Field_Decli...