Well I can help with the smallest of your problems:

MPL uses days past 1/1/1 0:0:0 and
01-JAN-0001 00:00:00 in JD = 1721425.5

so:  JD = MPL_DAY + 1721425.5

but - there is no "integrated" way to do this automatically inside the plotting 
system.

Ted


----- Original Message -----
From: Yannick Copin <[EMAIL PROTECTED]>
Date: Thursday, August 10, 2006 5:16 am
Subject: [Matplotlib-users] Plot dates and julian dates on the same figure

> Hi,
> 
> I'd like to plot some dates on a figure with two different x-axes: 
> the 
> bottom one with date labels (strings), and the top one with julian 
> date 
> labels (integers), see 
> http://www.astrosurf.com/snweb2/2005/05el/curves/05elF_10.jpg for 
> an 
> example.
> 
> I tried to follow the method mentionned in 
> http://sourceforge.net/mailarchive/message.php?msg_id=11822985, 
> but 
> unfortunately, this didn't work: as mentionned in 
> http://sourceforge.net/mailarchive/message.php?msg_id=11824491, it 
> looks 
> impossible to use different tick formatters for different axes (in 
> my 
> case a DateFormatter for the bottom axis, and a FormatStrFormatter 
> for 
> the top one).
> 
> Any suggestion for this???
> 
> Cheers.
> 
> PS: as a side-question, is there an integrated way to convert a 
> date 
> (e.g. matplotlib.datetime.date(2006,8,10)) to a julian date 
> (2453958) 
> using matplotlib?
> -- 
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