<html><head></head><body>I second gnuplot. It does particularly well with time (hours:min, days, months etc) while Excel quickly becomes a lesson in frustration!<br><br><div class="gmail_quote">On January 11, 2016 1:03:04 PM EST, Clemens Lang <cal@macports.org> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail">On Sun, Jan 10, 2016 at 09:57:02PM -0500, Charles Phillips wrote:<br /><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"> Right now I use Numbers for some, and have struggled with Excel. I<br /> need a flexible program that allows me to enter some columns of data<br /> (perigee, apogee, inclination, etc) and graph them again time of the<br /> orbital description (I use Two Line Element sets from the U.S. Air<br /> Force). <br /></blockquote><br />gnuplot should be able to handle this, can be heavily customized, easily<br />automated and has multiple possible outputs (images, PDF, screen, ...)<br /><br /><br />HTH,</pre></blockquote></div><br>
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--Adam</body></html>