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I want to watch the ISS with naked eye using this tool NASA gives https://spotthestation.nasa.gov/sightings/view.cfm?country=Argentina&region=None&city=Santa_Fe#.WCRzKS3hC1s but I dont know how to read grades in the sense of which direction I have to look to, in order to see the ISS.

Pablo
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    "Grades" - I'm not sure what you mean, but do you mean phrases like "SSW"? If so have a look at Points of the compass and look for the compass point names. You will also need to know which way is North/South at your observing site. (Once seen, the ISS is fairly obvious as a bright, moving, slightly yellow star.) – Andy Nov 10 '16 at 17:26
  • probably, it says for example "Appears 10° above SSW" , "Disappears 16° above S" – Pablo Nov 10 '16 at 18:37
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    Those are angles to indicate the altitude ("height") of the ISS above the horizon. 0° is on the horizon, 90° is the point directly overhead (zenith). All other values must be in between; the larger the angle, the higher the ISS is above the horizon. – AstroFloyd Nov 25 '16 at 18:21
  • if you want you can post the comment as answer so I can mark it – Pablo Nov 25 '16 at 18:31

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