On June 30, 1973, Concorde 001 intercepted the path of a solar eclipse over North Africa, Flying at Mach 2.05 the aircraft provided seven observers from France, Britain and the United States with 74 min of totality bounded by extended second (7 min) and third (12 min) contacts. The former permitted searches for time variations of much longer period

Abstract image available at: http://adsabs.harvard.edu/abs/1973SoPh...31..319B

Abstract image available at: http://cdsads.u-strasbg.fr/abs/1973SoPh...31..377V

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Abstract image available at: http://adsabs.harvard.edu/abs/1973SoPh...29...25B

Abstract image available at: http://adsabs.harvard.edu/abs/1973A&A....22..321D