source: trunk/FACT++/www/smartfact/struct/help-visibility.page@ 18907

Last change on this file since 18907 was 18403, checked in by tbretz, 9 years ago
File size: 761 bytes
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1Visibility
2|
3The visibility curve shows the altitude of all sources visible
4between the start of the astronomical twilight in the evening and the
5end of the astronomical twilight in the morning. It only shows sources visibly above
665° zenith distance.
7
8The title shows roughly the start and end time of the time range diaplayed
9and the number of minutes corresponding to one of the twenty
10steps on the x-axis.
11
12To relate the curves to the visible sources, the order in which they
13culminate is given above the graphics. For sources culminating within
14the displayed time-range, also their zenith distance at culmination is
15listed.
16
17Note that the zenith distance is counted from the zenith, while
18the altitude is counted from the horizon: Zd=90°-Alt
19|
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