Termenul de tropice este unul relativ des răspîndit în vorbirea curentă, cu toate acestea, majoritatea oamenilor nu ştiu ce înseamnă şi unde sunt localizate acestea. Definirea lor este, în schimb, mult mai uşoară decât pare.
Tropicele sunt două linii imaginare, trasate însă de geografi, linii care mărginesc la nord şi la sud, Ecuatorul. Între cele două linii ale tropicelor se află zona tropicală. Tropicul de nord, situat în Emisfera Nordică este denumit Tropicul Racului, iar tropicul de sud, situat în Emisfera Sudică, este denumit Tropicul Capricornului.
Fiecare tropic are stabilită o lăţime de 2.600 kilometri. Pe orice hartă geografică, ambele tropice sunt situate la o latitudine de 23 grade nord sau sud de Ecuator.
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