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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WERXVEL57YVEQ7XAUAVP2CCJ4BXVSSEF/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "WERXVEL57YVEQ7XAUAVP2CCJ4BXVSSEF",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/Y27FSKYG7QAT7A5H67BUCSSBNGDF6LHM/",
    "sender": {
        "address": "juicewvu (a) gmail.com",
        "mailman_id": "2e9c506b76b74a38aa4f26e5f63bf9b1",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/2e9c506b76b74a38aa4f26e5f63bf9b1/emails/"
    },
    "sender_name": "Josh Smith",
    "subject": "[amsat-bb] Re: Satellite Orbit Prediction in Python",
    "date": "2009-09-28T12:49:56Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/Y27FSKYG7QAT7A5H67BUCSSBNGDF6LHM/",
    "children": [],
    "votes": {
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    },
    "content": "Mark,\nThanks for the link - I've been considering trying to cobble together\na \"web service\" that will create an ical or rss feed of upcoming\npasses over my QTH.  Hopefully this library is the kick in the rear\nend I need to get working on this.\n\n\nThanks,\nJosh Smith\nKD8HRX\nemail/jabber:  [email protected]\nphone:  304.237.9369(c)\n\n\n\n\n\nOn Mon, Sep 28, 2009 at 2:06 AM, Mark VandeWettering <[email protected]> wrote:\n> I just thought I'd drop a quick note here about some fun I've been\n> having today with satellite orbit prediction in Python.   When I\n> started mucking around with satellites, I used \"predict\", which was\n> pretty good, but at some point I wanted to answer some questions which\n> weren't easy to answer using predict.   Questions like \"when will\n> AO-51 be visible from both my home in CM87 and locations in Hawaii\",\n> or \"what was the radius of the circle of visibility for AO-7 compared\n> to ISS\"?\n>\n> Luckily, I'm a programmer.   In fact, I'm a programmer who programs\n> for fun.   So, I did a bit of research, and then coded up a version of\n> G3RUH's \"Plan 13\" algorithm in Python, and then wrote some scripts to\n> download elements from celestrak, and then a simple one to print data\n> on the next pass of any named satellite.     And, they worked pretty\n> good.  I've used them for the last year or so to do all my pass\n> predictions.   But there are still a couple of minor issues with the\n> library.  It didn't handle geosynchronous satellites very well.   It\n> implemented only the most basic of orbital models.   I was never\n> confident that the \"is this satellite in eclipse\" stuff working\n> exactly right.\n>\n> Luckily though, it turns out that someone else has been busy writing a\n> more complete library: PyEphem http://rhodesmill.org/pyephem/\n>\n> It's a library whose primary purpose is to calculate the positions of\n> astronomical objects.    I've used it a couple of times to (for\n> instance) figure out the size of Mars compared to Jupiter, and found\n> it very easy to use.   But today, I realized that it had a full\n> implementation of the SGP4 and SDP4 orbital models built in, and could\n> be used to predict satellite passes.    As a proof of concept, I\n> hacked together a 23 line script that could print the details of\n> upcoming ISS passes.   It seems to work great, and is really quite\n> easy to use.\n>\n> You can find some of the simple example code at my blog:\n>\n> http://brainwagon.org/2009/09/27/how-to-use-python-to-predict-satellite-locations/\n>\n> I'll probably be porting all of my existing scripts to use this soon.\n>  In the mean time, if you have a similar task, you might look to it to\n> solve your custom satellite prediction problems.\n>\n> 73 Mark K6HX\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n\n",
    "attachments": []
}