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| 1 | Visibility
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| 2 | |
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| 3 | The visibility curve shows the altitude of all sources visible
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| 4 | between the start of the astronomical twilight in the evening and the
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| 5 | end of the astronomical twilight in the morning. It only shows sources visibly above
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| 6 | 65° zenith distance.
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| 7 |
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| 8 | The title shows roughly the start and end time of the time range diaplayed
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| 9 | and the number of minutes corresponding to one of the twenty
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| 10 | steps on the x-axis.
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| 11 |
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| 12 | To relate the curves to the visible sources, the order in which they
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| 13 | culminate is given above the graphics. For sources culminating within
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| 14 | the displayed time-range, also their zenith distance at culmination is
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| 15 | listed.
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| 16 |
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| 17 | Note that the zenith distance is counted from the zenith, while
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| 18 | the altitude is counted from the horizon: Zd=90°-Alt
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| 19 | |
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