Prolog - The Solar System.

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Prolog is excellent for queries on relational data (as in the Mathematical sense of a "relation"), e.g.

 ```orbits(mercury, sun). {facts} orbits(venus, sun). orbits(earth, sun). orbits(mars, sun). orbits(moon, earth). orbits(phobos, mars). orbits(deimos, mars). planet(P) <= orbits(P, sun). {rules} satellite(S) <= orbits(S, P) and planet(P). ? satellite(S). {query} ```
 orbits(mercury, sun). {facts} orbits(venus, sun). orbits(earth, sun). orbits(mars, sun). orbits(moon, earth). orbits(phobos, mars). orbits(deimos, mars). planet(P) <= orbits(P, sun). {rules} satellite(S) <= orbits(S, P) and planet(P). ? satellite(S). {query}

Apparently this was used in question 24 'Evolution of Programming Languages', in Section III of 'Software Design and Development', 2010 Higher School Certificate Examination, NSW.

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 © L. Allison   http://www.allisons.org/ll/   (or as otherwise indicated), Faculty of Information Technology (Clayton), Monash University, Australia 3800 (6/'05 was School of Computer Science and Software Engineering, Fac. Info. Tech., Monash University, was Department of Computer Science, Fac. Comp. & Info. Tech., '89 was Department of Computer Science, Fac. Sci., '68-'71 was Department of Information Science, Fac. Sci.) Created with "vi (Linux + Solaris)",  charset=iso-8859-1,  fetched Thursday, 29-Oct-2020 05:10:00 AEDT.