The celestial coordinate system is exactly analogous to the terrestrial positioning system
based on latitude and longitude.
Terrestrial latitude ---> celestial 'declination'.
Terrestrial longitude ---> celestial 'right ascension', where one 'hour' = 15 degrees.
The most common coordinate system used in astronomy is the equatorial coordinate system, which is based on the celestial equator and the celestial poles. It uses declination to measure north and south of the celestial equator, and right ascension to measure eastward along the celestial equator.
The widely accepted celestial coordinate system of Right Ascensions and Declinations would be most useful to them, if they both knew their way around with it, and at least one of them knew the celestial coordinates of the object.
In astronomy more than just one coordinate system is used. Each of these have a distinct purpose. For general use, most astronomers use Right Ascension and Declination. These are roughly equivalent to Longitude and Latitude respectively. The celestial equator is the same as the Earth' equator but then projected in the sky. The zero meridian is equivalent to the position of the sun on 21th March 12:00 GMT (per definition). The definition used above is useful but not really intuitive when you start with astronomy. People tend to look more to the angle of an object above the horizon. That can be used. Then the second coordinate is the azimuth angle, or the angle from north. However, because of the diurnal motion of the Earth this position is not constant. Another coordinate system used is the galactic system. Then the position of the centre of our galaxy (in the constellation of Ophicius) is used as the zero position. But this is mainly used by people interested in galaxy astronomy. One can also use our solar system as a reference frame. Then the equator of the sun is the equator and all the planets move roughly on this line, aka the equinox. This is mainly of interest when you want to calculate planetary movements in the sky. Conclusion: there is not a single coordinate system, but the first position system is the most widely used. Directly followed by the second.
The cartesian coordinate system is the basic coordinate system people are familiar with. If you were to plot a basic X Y graph, where X and Y increase towards infinity, you are graphing in the cartesian coordinate system. There are a few other popular coordinate systems for more advanced math, but they are rarely used by most people. (polar coordinate system is common for some calculus equations)
Most men join Fraternities to meet new guys with similar qualities as themselves, to coordinate parties and to mingle with Sorority members.
Our Sun, although with the amount of debris in Earth orbit...
most of the objects in our solar system orbit what celestial body
Our Sun, although with the amount of debris in Earth orbit...
Adromada
capitalism
Mars is most similar to Earth.
Dictatorship