The outer planes ( outer planes ) are planets in the solar system whose orbits are outside the orbit of the planet on which the observer is located. For the Earth observer, these are planets beyond the limits of the Earth's orbit, that is, starting from Mars [1] . The term “upper planets” arose in connection with the geocentric system of the world , according to which these planets rotated above the sphere of the Sun [2] .
The upper planets are also called “external”, but in recent years this term is also sometimes (from the point of view of classical astronomy erroneously) used only for planets belonging to the outer region of the solar system (outside the asteroid belt ), that is, giant planets [3] [4] .
See also
- Lower planets
Notes
- ↑ P. G. Kulikovsky. Handbook of amateur astronomy . - 4th ed. - M: Science, 1971. - p. 252. - 635 p. - ISBN 9785458272117 .
- ↑ Upper planets - an article from the Great Soviet Encyclopedia .
- ↑ Vyacheslav Likso, Dmitry Koshevar. Universe studies and planetology . - Ast, 2016. - p. 41. - 210 p. - ISBN 9785040080236 .
- ↑ Outer Planets - an article from the Great Soviet Encyclopedia .