The Moon's orbit is inclined at 5° to the plane of the Earth's orbit around the Sun. A lunar eclipse occurs when the Earth moves between the Sun and the Moon such that the three bodies are in line and the Moon moves into the Earth's shadow. Lunar eclipses can only occur when the moon is near full and can be seen from anywhere on Earth where the moon is above the horizon. The Moon doesn't normally completely disappear since it is illuminated by light scattered from Earth's atmosphere, but it usually becomes a reddish, coppery colour.
The full shadow of the Earth, called the umbra, is surrounded by a partial shadow, called the penumbra. At the beginning and end stages of an eclipse, the Moon moves into the penumbra. This shadow is barely discernible on the lunar disk and eclipses where the Moon only passes through the Earth's penumbra are known as Penumbral Eclipses. There are two other types of eclipse: Partial where only a part of the moon passes though the Earth's umbral shadow and Umbral where the Moon is totally enveloped by the umbra. These eclipses are better known as Total Lunar Eclipses.
The Eclipse Details screen lists the times at which various events in an eclipse occur. The amount of information presented will depend on the type of eclipse, with total (umbral) eclipses having the most information. All times are presented in local time (not UT).
Below these times, for reference, are the times of moonrise, moonset and sunrise and sunset for the day in question.
This window also shows whether or not the eclipse is visible from your location.
The right half of the screen is taken up by the eclipse diagram. This shows the position of the moon in the umbra and/or penumbra at the time of maximum eclipse. The horizontal line represents the plane of the Earth's orbit and the slanted line, the path of the moon in it's orbit (going from left to right).