星图
3.Clicking the Set Map Time button will dismiss the dialog, and set the date and time of the current map to that of the most recent conversion performed.
8.Click the Star Chart button to set the date and time of the current star chart to the approximate time of the middle of the selected eclipse.
9.The Layout page defines the size of the margins around the edge of the printed map, and also controls whether the current map field of view is "fitted" onto the printed map page vertically or horizontally.
10.Compare to existing results for general graph, new lower bound on the size of the minimum feedback vertex set of (n, k)-star graph is given based on its special structure.
