A total lunar eclipse occurs when the Earth blocks all direct sunlight from reaching the Moon. There could be partial lunar eclipses occurring in a year too. The number of lunar eclipses in a single year can range from 0 to 3. On June 16, 2011, a total lunar eclipse occurred, which was visible for over 100 minutes in different parts of Asia, Europe and Africa. The partial eclipse lasted for 3 hours and 40 minutes, making it the longest total lunar eclipse in this decade.