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In astronomy, coordinate systems are used for specifying positions of celestial objects (satellites, planets, stars, galaxies, etc.) relative to a given reference frame, based on physical reference points available to a situated observer (e.g. the true horizon and north to an observer on Earth's surface). [1]
One important discovery made at different times in different places is that the bright planet sometimes seen near the sunrise (called Phosphorus by the Greeks) and the bright planet sometimes seen near the sunset (called Hesperus by the Greeks) were actually the same planet, Venus. [7] Animation depicting Eudoxus' model of retrograde planetary ...
The highest part of the surrounding, where the elements are found in their purity, he calls Olympus; the regions beneath the orbit of Olympus, where are the five planets with the sun and the moon, he calls the world; the part under them, being beneath the moon and around the earth, in which are found generation and change, he calls the sky.
Books 7 and 8 start freshly; they lay out the theory and practice when working with fixed stars and conclude with a catalogue of 1,022 stars. Books 9 to 13 are dedicated to the five visible (and thus, at the time, the five known) planets. Book 9 lays out a general approach for all the planets, followed by the theory for Mercury.
An artist's concept of a planetary system. A planetary system is a set of gravitationally bound non-stellar bodies in or out of orbit around a star or star system.Generally speaking, systems with one or more planets constitute a planetary system, although such systems may also consist of bodies such as dwarf planets, asteroids, natural satellites, meteoroids, comets, planetesimals [1] [2] and ...
Final Take To GO. Budgeting can be easier when you breakdown your expenses into three categories — needs, wants and savings. 50% goes to necessities, 30% to wants and 20% to the savings category ...
When you’re listing out expenses, don’t start with fixed or variable–start with what’s essential. This means covering your Four Walls (food, utilities, shelter and transportation) first ...
Determining your fixed and variable expenses is paramount to effectively building a budget. But while accounting for necessary costs is a simple and straightforward task, including discretionary ...