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![]() wrote in message oups.com... On Apr 5, 5:33 pm, RomeoMike wrote: DR wrote: Declination in navigation is actually something else but I'll let you googgle for it. I'm not sure that's really true. In aviation we talk about variation, but when I'm using 7.5' topo maps on the ground, declination is the term used for the difference between magnetic and true north. (See the bottom left of a US DOI Geologic Survey 7.5' topo.) Variation and declination are defined the same If there's a more sophisticated use of the word declination in navigation, I'm willing to be enlightened. OK, it's celestial Nav. Stars are located by declination (angle from the celestial equator) and RA. The geographical use of declination to describe variation is the result of bad education propagating a specilaized technical term into incorrect use IMHO. As I think about it, how could a word derived from "decline" be related to horizontal angle...? Cheers MC Declination also applies to the earth's magnetic field, and can be measured and charted. However, its use generally involves an earth inductor compass. (BTW, Lindberg apparently had one installed on the Spirit of St Louis; but I don't know whether he ever commented on the ease of use in what obviously qualified as a light aircraft.) Peter |
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