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May 22, 2019 · May 22, 2019. Northern lights over Lake Lappajärvi in Finland. Image via Santeri Viinamäki. By Nathan Case, Lancaster University. Like most planets in our solar system, the Earth has its own...
- How Do The Norths Align?
- The Ever-Changing Magnetic Poles
- Geographic North
- An Alignment at Greenwich
Magnetic north and geographic north align when the so-called “angle of declination”, the difference between the two norths at a particular location, is 0°. Declination is the angle in the horizontal plane between magnetic north and geographic north. It changes with time and geographic location. On a map of the Earth, lines along which there is zero...
Most compasses point towards Earth’s north magnetic pole, which is usually in a different place to the north geographic pole. The location of the magnetic poles is constantly changing. Earth’s magnetic poles exist because of its magnetic field, which is produced by electric currents in the liquid part of its core. This magnetic field is defined by ...
Geographic north, perhaps the more straightforward of the two, is the direction that points straight at the North Pole from any location on Earth. When flying an aircraft from A to B, we use directions based on geographic north. This is because we have accurate geographic locations for places and need to follow precise routes between them, usually ...
For hundreds of years, declination at Greenwich was negative, meaning compass needles were pointing west of true north. At the time of writing this article I used an online calculatorto discover that, at the Greenwich Observatory, the Earth’s magnetic field currently has a declination just above zero, about +0.011°. The average rate of change in th...
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Feb 4, 2019 · Photograph by NASA/JSC. SCIENCE. NEWS. Magnetic north just changed. Here's what that means. The foundation of many navigation systems, the World Magnetic Model finally got a much-needed...
