[amsat-bb] Re: calculation of eclipse

Clive Wallis list1 at g3cwv.co.uk
Fri Sep 30 02:04:52 PDT 2011

Ooops!  I forgot to say that the file is satill.zip on my website 

It's on the OSCAR-11 page and the general satellite page.

73    Clive   G3CWV

On 30/09/2011 08:51, Clive Wallis wrote:
> Hi Norm,
> I did this many years ago for OSCAR-11, and published an outline of the
> procedure in OSCAR News.
> The calculations were based on procedures written by James Miller G3RUH.
> There is a package of files which includes the software, documentation
> and original G3RUH articles. It's a long time ago since I did this, but
> IIRC there is a spread sheet graph which compares the eclipse prediction
> with the solar array currents.
> 73 Clive G3CWV

> Hitchin, North hertfordshire, UK
> On 30/09/2011 00:33, normn3ykf at stny.rr.com wrote:
>> Hi all!!
>> How does one calculate the period and time of entry and exit of eclipse?
>> I'm going to be helping a friend do an Arissat presentation for her
>> class. Due to the fact of the battery failing, this gives a 15 minute
>> hold before the power management allows transmission. So, for any
>> chance of receiving the bird, it has to be in sunlight for 15 minutes
>> (or so).
>> I'd prefer a mathematical formula. Echo goes through some of the same
>> trials.
>> Thanks,
>> Norm
>> BTW: I am an engineering student, just throw the math my way.

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