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Solar eclipse of June 30, 1973 ：ウィキペディア英語版

Solar eclipse of June 30, 1973

A total solar eclipse occurred on June 30, 1973. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. A total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide.
With a maximum eclipse of 7 minutes and 4 seconds, this was the last total solar eclipse that exceeds 7 minutes in this series. There will not be a longer total solar eclipse until June 25, 2150.
== Observations ==
This eclipse was observed by a group of scientists from the Los Alamos National Laboratory using two airplanes to extend the apparent time of totality by flying along the eclipse path in the same direction as the Moon's shadow as it passed over Africa. One of the planes was a prototype of what later became the Concorde, which has a top speed of almost . This enabled the scientists to experience a period of totality that lasted more than 74 minutes, nearly 10 times longer than is possible when viewing a total solar eclipse from a stationary location.
The eclipse was also observed by a charter flight from Mount San Antonio College in Southern California. The DC-8 with 150 passengers intercepted the eclipse at just off the east coast of Africa and tracked the eclipse for three minutes. The passengers rotated seats every 20 seconds so that each passenger had three 20 second opportunities at the window to observe and take pictures.

抄文引用元・出典: フリー百科事典『ウィキペディア（Wikipedia）』
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