3 ms·
http://maps.ngdc.noaa.gov/viewers/historical_declination/ http://maps.ngdc.noaa.gov/viewers/historical_declination/
by 001sky 13y ago
http://maps.ngdc.noaa.gov/viewers/historical_declination/ http://maps.ngdc.noaa.gov/viewers/historical_declination/
- robryk 13y agoThanks. I didn't know that the differences change in space in such weird fashion. I guess what was meant were spatial differences, not temporal ones and it now the part about magnetic field makes some sense to me.