"Along with the GGS Wind and Advanced Composition Explorer (ACE), SOHO is one of three spacecraft currently in the vicinity of the Earth-Sun L1 point, a point of gravitational balance located approximately 0.99 astronomical unit (AU)s from the Sun and 0.01 AU from the Earth." In other words, it is located at the Lagrange 1 point relative to the Earth, a stable point slightly sunward of Earth, 1/100 of the distance from Earth to the Sun.
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