Inferior and superior planets the orbit of Earth. These terms were originally used in the geocentric cosmology of Claudius Ptolemy to differentiate as inferior those planets (Mercury and Venus) whose epicycle remained co-linear with the Earth and Sun, and as superior those planets (Mars, Jupiter, and Saturn) that did not. In the 16th century, the terms were modified by Copernicus, who rejected Ptolemy's geocentric model, to distinguish a planet's orbit's size in relation to the Earth's. When Earth is stated or assumed to be the reference point: The terms are sometimes used more generally; for example, Earth is an inferior planet relative to Mars.
Against the Current: Essays in the History of Ideas published in 1973. In this essay, Berlin explains his theory of a Counter-Enlightenment. Berlin traces the ideology of figures such as Giambattista Vico, from their opposition to enlightenment ideals to the emergence of Romanticism and Existentialism. Against the Current: Essays in the History of Ideas Against the Current: Essays in the History of Ideas (1979) is a collection of essays by 20th century philosopher and historian Isaiah Berlin. The collection was edited by Henry Hardy, and featured an introduction by Roger Hausheer. The book collects previously published essays in which Berlin discusses the thoughts of 20th century ideologic dissenters who