Accessed with this icon on the main toolbar, or from the Analyze menu.
Geography options control the behaviour. In particular this will determine if you drag a sunlight graph and place it on the map, or if it appears in a separate window.
If you pick drag sunlight graphs:
If you have the drag sunlight graphs unchecked.
- Short table calculates sunrise/sunset
- Long table adds civil/nautical/ astronomical twilight
- Graphical plot shows sunrise, sunset, and the length of daylight at desired position throughout the year.
If you pick the icon with no map active:
Algorithm from pages B5-B7, Almanac for computers 1989, Nautical Almanac Office, U.S. Naval Observatory. Valid for latitudes less than 65° (deteriorates near poles when sun above or below horizon longer than 24 hours) at any time in the latter half of the 20th century. Accurate ± 2 min.
Note that these times give a best guess estimate for the difference to UTC.
Last revision 11/29/2006