{QTtext}{font: Arial}{bold}{size: 30}{textColor: 65535, 65535, 65535}{justify: center}{timeScale: 100}{width: 1920}{height: 72}{timeStamps:absolute}{language: 0}{textEncoding: 0}{keyedText: on}{anti-alias: off}{dropShadow: on}{dropShadowOffset: 1,1}{dropShadowTransparency: 200}{useMovieBackColor: on} [00:00:00.180] When the new moon passes exactly in front of the sun, [00:00:03.700] its shadow crosses the Earth. [00:00:05.700] [00:00:06.580] The deepest part of the shadow is called the umbra. [00:00:09.740] [00:00:10.140] People in the umbra see a total solar eclipse. [00:00:13.780] [00:00:14.020] It takes about an hour for the shadow to cross the earth. [00:00:17.300] [00:00:18.840] Two weeks later, the full moon can cross into Earth's umbra. [00:00:23.280] [00:00:23.780] Since the Earth is four times the diameter of the Moon, [00:00:27.460] the umbra is also four times larger or 16 times the area. [00:00:32.540] [00:00:33.220] So lunar eclipses are more common than solar eclipses. [00:00:37.680] [00:00:38.320] Everyone on the nightside of Earth can see a total lunar eclipse. [00:00:42.780] [00:00:43.200] But only people in the narrow strip of totality [00:00:46.360] can see a total solar eclipse. [00:00:49.040] [00:00:49.360] So, not only are lunar eclipses more common, [00:00:53.060] more people can observe each one. [00:00:56.200] [00:00:56.660]