<br><div class="gmail_quote">Hi,<br> <br>the problem with the other formulas (you can finde them at <a href="http://en.wikipedia.org/wiki/airmass" target="_blank">en.wikipedia.org/wiki/airmass</a>) is, they maybe more precize but they have a different scala. You say that 1/sin(h) is use, which contributes to a homogeneous plane-parallel atmosphere with no curvature of earth surface attended. It gives reasonable results down to heights 10 degrees above horizon.<br>
<br>I think it should be discussed whether it is a good idea to change it or leaf it for the users convenience as it is. Only pros would rather notice, but more often they would ignore it. I am not sure how using a different formula with an implied different scalar relates to different values in photometry.<br>
A correct airmass is necessary for absolute photometry. <br>I can provide such a batch, if it is considered necessary.<br><br>For the problem with the batch processing an example file would just help so I can figure out and maybe write a script for producing the correct input/output syntax for the processing. <br>
<br>regards,<br><font color="#888888">Christian</font><div><div></div><div class="h5"><br><br><div class="gmail_quote">On Sat, Sep 11, 2010 at 10:43 AM, Akarsh Simha <span dir="ltr"><<a href="mailto:akarshsimha@gmail.com" target="_blank">akarshsimha@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hi Christian,<br>
<div><br>
> Hi,<br>
><br>
> I have two questions. Where can I get an example file and some<br>
> documentation about the batch processing in the calculator section. An<br>
> example for the input and the output file would be nice.<br>
<br>
</div>The batch processing had a lot of bugs, I don't know if anybody uses<br>
it and whether there's any documentation regarding that. So I'm afraid<br>
I don't know the answer to this, but I guess other developers here<br>
might.<br>
<div><br>
> The second questions is, what formular did you use to determin the<br>
> airmass? Was it Pickering (2002) X = 1/sin(h+244/(165+47h^1.1)) and where<br>
> in the source code do I find it?<br>
<br>
</div>I found this in the file kstars/dialogs/detaildialog.cpp (line 326):<br>
<br>
//Airmass is approximated as the secant of the zenith distance,<br>
//equivalent to 1./sin(Alt). Beware of Inf at Alt=0!<br>
<br>
and it's followed by the same calculation described in the comment.<br>
<br>
That's bad! If you have the source code checked out and are capable of<br>
compiling it, you're welcome to replace it with the better formula you<br>
have and submit a patch.<br>
<br>
Thanks for pointing this out.<br>
<br>
Regards<br>
<font color="#888888">Akarsh<br>
</font></blockquote></div><br><br clear="all"><br></div></div><div><div></div><div class="h5">-- <br>The components have no significance except as they contribute to a functioning whole.<br><br>No trees were killed in sending this message. However, a large number of electrons were seriously inconvenienced.....<br>
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