From: Paul Winalski <paul.winalski@gmail.com>
To: Ken Thompson <ken@google.com>
Cc: The Eunuchs Hysterical Society <tuhs@tuhs.org>
Subject: Re: [TUHS] In Memoriam: J.F.Ossanna
Date: Wed, 28 Nov 2018 12:08:17 -0500 [thread overview]
Message-ID: <CABH=_VS0thKQW_cg3FjA0+1SL7NOw0yTAzMDk9fMKwyhUxms+A@mail.gmail.com> (raw)
In-Reply-To: <CAG=a+rhnRWn4a7vnr51_Yeqfq5UA7_Hm5p8sy8jvNK64h=W7Fw@mail.gmail.com>
On 11/27/18, Ken Thompson via TUHS <tuhs@minnie.tuhs.org> wrote:
> another joe:
>
> echo 1 was a 100 foot balloon that was
> launched into space in the early 60s. this
> was the first satellite that was easily visible
> to the naked eye.
>
> joe wrote a set of fortran programs that
> tracked the orbit of echo and calculated
> the direction to look from a point on earth.
> to do this, he had to learn fortran and
> orbital dynamics.
>
> by the time i came to bell labs (1966) the
> program, azel, for azimuth/elevation, was
> expanded to track planets, moons, satellites,
> etc. moreover, it tracked the shadow of the
> earth cast by the sun (night). it could predict
> within a few seconds when echo would wink
> on or off as it passed through the shadow.
>
> a version of azel was maintained all the time
> i was at bell labs. we used it to predict
> eclipses, transits, occultations etc. when
> we first got a voice synthesizer, the day's
> predictions were spoken at 5pm in case
> there was anything interesting.
>
What a great story. There is today a website (heavens-above.com) that
does the same thing as Joe's azel. Amateur Astronomers visit it
regularly to get the night's predictions for visible satellite
transits, visible passes of the International Space Station, etc. I
had no idea the idea went back that far.
-Paul W.
next prev parent reply other threads:[~2018-11-28 17:09 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-27 21:47 Dave Horsfall
2018-11-27 23:08 ` Ken Thompson via TUHS
2018-11-28 2:57 ` Larry McVoy
2018-11-28 4:48 ` Ken Thompson via TUHS
2018-11-28 14:44 ` Dan Cross
2018-11-28 17:08 ` Paul Winalski [this message]
2018-11-28 19:03 ` WIlliam Cheswick
2018-11-28 19:04 ` WIlliam Cheswick
2018-11-28 17:57 ` Earl Baugh
2018-11-28 18:23 ` ron minnich
2018-11-29 17:54 ` [TUHS] [OT] azel - was " Toby Thain
2018-11-29 17:57 ` Warner Losh
[not found] ` <CAG=a+rhvgikmvEPS_Z-umK2XPYfaxHmov_3QZuD0GcE97BN1qw@mail.gmail.com>
2018-11-29 20:11 ` Toby Thain
2018-11-28 5:22 ` [TUHS] " Fabio Scotoni
2018-11-28 9:20 ` Donald ODona
2018-11-29 3:54 ` Dave Horsfall
2018-11-28 13:09 Noel Chiappa
2019-11-27 20:53 Dave Horsfall
2019-11-28 0:06 ` Warner Losh
2019-11-28 0:43 ` Finn O'Leary
2019-11-28 17:16 ` ron
2019-11-28 17:18 ` ron
2019-11-28 0:46 ` David Arnold
2019-11-28 3:43 ` Larry McVoy
2019-11-30 17:45 ` Finn O'Leary
2019-11-28 9:19 ` Thomas Paulsen
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