Re: ROSAT: evolution of predicted decay v9

From: Marco Langbroek (marco.langbroek@wanadoo.nl)
Date: Sun Oct 23 2011 - 12:31:05 UTC

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    Op 22-10-2011 23:48, Allen Thomson schreef:
    >
    >
    >> All digital cameras record what is known as EXIF data and insert that
    >> in an image, along with GPS data. If you can access the uploaded
    >> image (ie posted on a website) and it hasn't been modified in a
    >> processing package that modifies the data header, you can read that
    >> data which has the image date/time.
    >
    > Not to remain OT for long, but there's a freeware image viewer called IrfanView that, if you get the optional plugins, allows easy access to the EXIF data. I just gave myself a birthday present of a Casio Exilim EX-H20G camera with built-in GPS that writes to the EXIF file, and it plays well with IrfanView.
    
    Be aware that for camera's without GPS (most DSLR's), the time in the EXIF might 
    be off if the camera clock has not been synchronized. Camera clocks have a large 
    drift.
    
    Also, the ROSAT shot in question is a stack of multiple images, and the EXIF 
    will refer to only one of those.
    
    - Marco
    
    -----
    Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
    e-mail: sattrackcam@wanadoo.nl
    
    Cospar 4353 (Leiden):   52.15412 N, 4.49081 E (WGS84), +0 m ASL
    Cospar 4354 (De Wilck): 52.11685 N, 4.56016 E (WGS84), -2 m ASL
    Station (b)log: http://sattrackcam.blogspot.com
    Twitter: @Marco_Langbroek
    -----
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