midnight on the 1st of the selected month. If you'd rather run the animation without the lunar terminator, simply click the fourth icon to turn the terminator off. The animation will be stopped when the 1st of the following month is reached on the date/time banner, when you click the Stop icon or when you exit from the screen. The animation icon is disabled if either the North or South Pole view has been selected.

The seventh and final icon stops the libration animation if it's running. It only becomes active if the Play icon has been previously clicked. These two functions only work in the 3D spherical projection mode.

Options to display each of the moon's four quadrants are provided at the top right of the screen. These options work in both the Orthgraphic and Mercator projections.

The option to view the moon's North or South Poles is available. Once again, features can be identified by moving the mouse cursor over them and clicking the mouse. These pole views allow you to get a better perspective on what very northerly or southerly features look like.

The blue slider buttons at the top, bottom and right of the map let you zoom into the map and pan up/down or left/right across it. These sliders are available in both the Orthographic and Mercator views.

If the OpenGL option is turned off, then you'll see a Mercator projection map of the moon on the screen. This map does not display the lunar terminator. Nor does it display any lunar libration.

The toolbar presents five icons. The first icon will do nothing if the OpenGL option is turned off. The only map format available for display is the 2D Mercator projection.

The second icon lets you switch between optical views. When the Lunar Explorer screen is called, it displays the moon in the default optical configuration as specified on the Configuration screen. The icon can still be clicked, though, to change the view to suit your needs by cycling through the optical configurations available.

The third icon allows you to switch between views of the moon's Near side (the side we see) and the moon's Far side (the side we never get to see). Feature identification (by clicking on a feature on either near- or far-side map view) will also work on far-side features. Far-side features selected from one of the feature lists in the third pane will also be highlighted in yellow on the far-side map.

The fourth icon which toggles the lunar terminator on or off has no effect on the 2D Mercator Projection map.

The fifth icon calls up the Lunar Libration screen.