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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/4SJ67O7VVAPOVTT6ECZKXSLOAW2NZGNV/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "4SJ67O7VVAPOVTT6ECZKXSLOAW2NZGNV",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/4SJ67O7VVAPOVTT6ECZKXSLOAW2NZGNV/?format=api",
    "sender": {
        "address": "bryan (a) kl7cn.net",
        "mailman_id": "4060a44f8976432582122ef012353229",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/4060a44f8976432582122ef012353229/emails/?format=api"
    },
    "sender_name": "Bryan Green",
    "subject": "Re: [amsat-bb] A pass from the past",
    "date": "2015-04-01T23:25:04Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi, David!\n\nI do gave the data as E-mailed to me each week from AMSAT via ARRL. I have an archive. \n\nWhen I tried as you suggested, neither Orbitron nor predict showed the time I observed -- they both have it coming over at about 05:34Z. They appeared to use current keps. \n\nSent from my iPhone\n\n> On Apr 1, 2015, at 15:50, David G0MRF <[email protected]> wrote:\n> \n> If I understand you correctly, you need to predict where the satellite was a couple of months ago.\n>  \n> To do that you need a set of keps from a date close to the one you are looking to predict.\n> At present AO-73 shifts about 4 minutes over a period of 1 month, so you need to be within 1 week to get reasonable accuracy.\n>  \n> I believe Celestrak or possibly the AMSAT archive may have this data.....but it's not very often used.\n>  \n> Regards\n>  \n> David\n>  \n>  \n> -----Original Message-----\n> From: Bryan Green <[email protected]>\n> To: AMSAT-BB <[email protected]>\n> Sent: Wed, 1 Apr 2015 22:24\n> Subject: [amsat-bb] A pass from the past\n> \n> Hello, all!\n> \n> Long story short:\n> \n> I have handwritten notes and a recording\n> from a past AO-73 pass.\n> \n> My notes are dated that the pass was from 05:18Z -\n> 05:31Z on 2015-01-29.\n> \n> My recording indicates that the start was at 05:19Z on\n> 2015-01-29. (I have the clock on the MP3 device set to UTC).\n> \n> I have a\n> spreadsheet of every pass I've tracked since the beginning of the year, and I'm\n> going back to update the AOS, Max, and LOS azimuths, since I didn't start\n> recording those until February.\n> \n> Here's what I did:\n> \n> Fed the AMSAT TLE file\n> from 2015-01-30 into Orbitron.\n> \n> It predicts AO-73 AOS at 05:32Z, and LOS at\n> 05:39Z\n> \n> Got the old-school predict program, fed it the same file, and got\n> exactly the same results.\n> \n> How can I best simulate an orbit prediction from\n> the past?\n> \n> I have SatPC32 but I don't understand how to use it to get a pass\n> prediction.\n> \n> Thanks in advance for the help!\n> \n> -- bag\n> \n> Bryan\n> KL7CN/W6\n> _______________________________________________\n> Sent via\n> [email protected]. AMSAT-NA makes this open forum available\n> to all interested\n> persons worldwide without requiring membership. Opinions expressed\n> are solely\n> those of the author, and do not reflect the official views of AMSAT-NA.\n> Not an\n> AMSAT-NA member? Join now to support the amateur satellite\n> program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n",
    "attachments": []
}