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| Thread ID: 141574 | 2016-01-14 03:30:00 | Magnetic declination in Auckland | Tony (4941) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1414466 | 2016-01-14 03:30:00 | Here's one for the trampers and geographers. I've seen a map of magnetic declination for the North Island, and the line that crosses Auckland is labelled "20.5". The line goes from south-west to north-east. Would that be described as "-20.5" or "+20.5"? |
Tony (4941) | ||
| 1414467 | 2016-01-14 04:24:00 | "+" | Zippity (58) | ||
| 1414468 | 2016-01-14 04:26:00 | It will be positive not negative, Tony. en.wikipedia.org |
KarameaDave (15222) | ||
| 1414469 | 2016-01-14 04:37:00 | If it was negative it would be 339.5 surely | gary67 (56) | ||
| 1414470 | 2016-01-14 08:04:00 | Thanks folks. I did a bit more reading after I posted and realized the question was a bit meaningless, but yes it would be "+". | Tony (4941) | ||
| 1414471 | 2016-01-14 08:07:00 | The magnetic declination (or magnetic variation) at any point on the earth is a property of the geomagnetic field defined as the angle that must be added or subtracted in converting between two kinds of directional information 1) the direction of the needle on a magnetic compass pointing at a location, magnetic heading and 2)the difference between the direction of the earth's lines of longitude, true track. The magnetic variation also increases (anti-clockwise) by 5° every 7 years. A good way to remember adding and subtracting, is East-is least and West-is best. |
WalOne (4202) | ||
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