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1b1ed1a
(Get the code!)
Since HEK features and events are being included in Helioviewer.org, this feature has become much more important.
In addition, this feature will allow users to create movies that track features and events across the disk. This can be added as a simple check box in the Movie Settings dialog. There are a couple of cases when tracking might not be offered. The first case is when the whole disk of the Sun is in the viewer window. Tracking of solar features does not make any sense then. The other case is when the user is zoomed out very far. In this case we can assume that the user is looking at data off of the disk of the Sun, so that even if only a part of the disk of the Sun is in the viewer window, there is no need for tracking to be applied.