context: The average distance of the planet from the Sun is 19.1914 a. e. (2.8 billion km). The period of complete revolution of Uranus around the Sun is 84 Earth years. The distance between Uranus and the Earth varies from 2.6 to 3.15 billion km [31]. The semimajor axis of the orbit is 19.229 a. e., or about 3 billion km. The intensity of solar radiation at this distance is 1/400 of the value in the Earth’s orbit [32]. For the first time, the elements of the orbit of Uranus were calculated in 1783 by the French astronomer Pierre-Simon Laplace [16], but over time, discrepancies between the calculated and observed positions of the planet were revealed. In 1841, Briton John Couch Adams was the first to suggest that the errors in the calculations are caused by the gravitational impact of the planet that has not yet been discovered. In 1845, the French mathematician Urbain Leverrier began independent work on calculating the elements of the orbit of Uranus, and on September 23, 1846, Johann Gottfried Galle discovered a new planet, later called Neptune, at almost the same place that Le Verrier predicted [33]. The rotation period of Uranus around its axis is 17 hours 14 minutes. However, as on other giant planets, in the upper atmosphere of Uranus very strong winds blow in the direction of rotation, reaching a speed of 240 m / s. Thus, near 60 degrees south latitude, some visible atmospheric details make a revolution around the planet in just 14 hours [34].
question: How far is Uranus from the earth?
answers.text: from 2.6 to 3.15 billion km