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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FUJYG3Y5PILNXAAMCSEF5B2MQ5RLU7TN/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "FUJYG3Y5PILNXAAMCSEF5B2MQ5RLU7TN",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FUJYG3Y5PILNXAAMCSEF5B2MQ5RLU7TN/",
    "sender": {
        "address": "twdeckard (a) earthlink.net",
        "mailman_id": "7ce245bfe53e49ee99247feaa165c0b9",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/7ce245bfe53e49ee99247feaa165c0b9/emails/"
    },
    "sender_name": "Todd W Deckard",
    "subject": "Re: [amsat-bb] AMSAT-BB Digest, Vol 13, Issue 168",
    "date": "2018-05-19T12:03:59Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "mailing list bounced my pedantic response due to attached image size ...\n\nhere’s a link to a parallel thread that has the image of ISS altitude over time.\n\nhttp://forums.qrz.com/index.php?threads/need-help-with-ascending-node.549308http://forums.qrz.com/index.php?threads/need-help-with-ascending-node.549308//\n\n\n\nSent from my iPhone\n\n> On May 19, 2018, at 6:43 AM, Todd W Deckard <[email protected]> wrote:\n> \n> As an aside, the ISS makes an adjustment approximately once a month.   They operate at a higher altitude now that the shuttle is no longer used for resupply.    Here is a plot from heavens-above.\n> \n> <image1.png>\n> \n> \n> I have observed that if you are using an Arduino or another processor with single precision math, the computed results age very quickly for any LEO and practically I must update every few days.\n> \n> if you are using a more respectable math engine and are only concerned about the orbital elements; the error in the satellite position is approximately a kilometer at the epoch of the TLE.   Then the simplified perturbation model (SPG4) used by the common software we use loses about 1-2km a day.\n> \n> all of this is a bit pedantic if you are hand pointing an antenna in the noble tradition ...\n> \n> best\n> Todd\n> Sent from my iPhone\n> \n>> On May 18, 2018, at 9:51 PM, [email protected] wrote:\n>> \n>> Send AMSAT-BB mailing list submissions to\n>>   [email protected]\n>> \n>> To subscribe or unsubscribe via the World Wide Web, visit\n>>   http://www.amsat.org/mailman/listinfo/amsat-bb\n>> or, via email, send a message with subject or body 'help' to\n>>   [email protected]\n>> \n>> You can reach the person managing the list at\n>>   [email protected]\n>> \n>> When replying, please edit your Subject line so it is more specific\n>> than \"Re: Contents of AMSAT-BB digest...\"\n>> Today's Topics:\n>> \n>>  1. Re: when are TLE's too old to use? (Gregory Beat)\n>>  2. Re: Recording TX & RX from one or two radios? (Mark D. Johns)\n>>  3. Re: when are TLE's too old to use? ([email protected])\n>>  4. FUNcube-1 mode change (Jim Heck)\n>>  5. Falconsat With Wisp and Kenwood TS-200  Internal TNC\n>>     (Vincenzo Mone)\n>>  6. Falconsat With Wisp and Kenwood TS-200  Internal TNC\n>>     (Vincenzo Mone)\n>>  7. Falconsat With Wisp and Kenwood TS-200  Internal TNC\n>>     (Vincenzo Mone)\n>>  8. Re: Recording TX & RX from one or two radios?\n>>     ([email protected])\n>>  9. Re: Recording TX & RX from one or two radios? (Ken M)\n>> 10. Re: Recording TX & RX from one or two radios? (John Brier)\n>> <mime-attachment>\n>> <mime-attachment>\n>> <mime-attachment>\n>> <mime-attachment>\n>> <mime-attachment>\n>> <mime-attachment>\n>> <mime-attachment>\n>> <mime-attachment>\n>> <mime-attachment>\n>> <mime-attachment>\n>> _______________________________________________\n>> Sent via [email protected].\n>> AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.  Opinions expressed\n>> are solely those of the author, and do not reflect the official views of AMSAT-NA.\n>> Not an AMSAT member? Join now to support the amateur satellite program!\n>> http://www.amsat.org/mailman/listinfo/amsat-bb\n",
    "attachments": []
}