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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WP6HPT7JC6BE3UIARYATTLP2GHTX7K2F/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "194DF5071B2248E9BA5C88DB2B1E3001@fotolab",
    "message_id_hash": "WP6HPT7JC6BE3UIARYATTLP2GHTX7K2F",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/WP6HPT7JC6BE3UIARYATTLP2GHTX7K2F/",
    "sender": {
        "address": "jlv (a) fing.edu.uy",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "jlv",
    "subject": "[amsat-bb] Re: Magnetic North vs True North",
    "date": "2011-09-09T01:03:48Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Ed:\nThat is true.\nFor my position\nMONTEVIDEO - URUGUAY Latitude: 34° 54' 38.2\" S\nLongitude: 56° 11' 35.9\" W\nMagnetic declination: 9° 34' WEST\nDeclination is NEGATIVE\nInclination: -39° 37'\nMagnetic field strength: 23116.9 nT\nregards\n\nJose Luis Vila\nCX2AN\n\n\n----- Original Message ----- \nFrom: \"Edward R. Cole\" <[email protected]>\nTo: \"jlv\" <[email protected]>\nSent: Thursday, September 08, 2011 1:12 PM\nSubject: Re: [amsat-bb] Re: Magnetic North vs True North\n\n\n> At 07:30 AM 9/8/2011, you wrote:\n>>True North\n>>\n>>tip:\n>>\n>>Look for the magnetic north with the compass, read their geographical \n>>coordinate in the GPS,\n>>use this webpage\n>>http://www.ngdc.noaa.gov/geomagmodels/Declination.jsp\n>>and calculate the magnetic declination for their place.\n>>You will know where this the true north using the magnetic north + / - the \n>>degrees of magnetic declination.\n>>\n>>Jose Luis Vila\n>>CX2AN\n>>CX0CFI op.\n>>\n>>-----Mensaje original----- From: Luc Leblanc\n>>Sent: Wednesday, September 07, 2011 10:07 AM\n>>To: [email protected]\n>>Subject: [amsat-bb] Magnetic North vs True North\n>>\n>>How i find my north!\n>>\n>>At noon always using standard time i pointed the beam in the direction of \n>>top tower pole shadow on the ground. Quite simple and accurate\n>>enough here.\n>>\n>>\"-\"\n>>\n>>\n>>Luc Leblanc VE2DWE\n>>Skype VE2DWE\n>>www.qsl.net/ve2dwe\n>>DSTAR urcall VE2DWE\n>>WAC BASIC CW PHONE SATELLITE\n>\n> thanks Jose,\n>\n> very useful as declination is moving +17min/year here\n> 17deg52min east\n>\n> I have old aviation maps of the region showing 26-deg declination.\n>\n> The sun shadow method works only if you know accurately what time solar \n> noon is.  For our time zone it is 2202:52 utc (today) which corresponds to \n> 2:02:52 pm local time.  So if you used the shadow at 12:00:00 local time \n> you would be off considerably from true north.  Of course one hour is due \n> to daylight savings time which advances the clock one hour in summer and \n> the fact that our local time was permanently advanced by one hour for \n> political/business reasons (so we would only be +4 hours from EST in the \n> USA).\n>\n> This is the reason that one must know true north to orient a sundial.\n>\n> Sea navigators know they either need to know time precisely to \"shoot the \n> sun\" and find their location or know true north to determine the exact \n> time of meridian crossing at noon.\n>\n>\n>\n> 73, Ed - KL7UW, WD2XSH/45\n> ======================================\n> BP40IQ   500 KHz - 10-GHz   www.kl7uw.com\n> EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-?\n> DUBUS Magazine USA Rep [email protected]\n> ====================================== \n\n",
    "attachments": []
}