Assertion: c | /r/HasProperty | earth's orbital velocity
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text: This apparently anachronistic analysis implies that Rømer was measuring the ratio ​c⁄ v , where c is the speed of light and v is the Earth's orbital velocity (strictly, the component of the Earth's orbital velocity parallel to the Earth–Jupiter vector), and indicates that the major inaccuracy of Rømer's calculations was his poor knowledge of the orbit of Jupiter.[note 7]