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RoseWind [281]
3 years ago
14

Perchè la terra è sferica?

Geography
2 answers:
CaHeK987 [17]3 years ago
7 0

Answer:

Causa La Terra è abbastanza massiccia che l'attrazione della gravità mantiene la sua forma approssimativamente sferica. La maggior parte della sua deviazione dagli steli sferici deriva dalla forza centrifuga causata dalla rotazione attorno al suo asse nord-sud. Questa forza deforma la sfera in un ellissoide oblato.

N76 [4]3 years ago
3 0

Answer:

Si vemos un barco acercándose desde la orilla del mar, nos damos cuenta de que los mástiles, las chimeneas y las partes más altas de la cubierta aparecen primero, y luego, por último, el casco. Lo contrario ocurre si el barco se aleja. Todo esto no sucedería si la Tierra fuera plana.

Per un osservatore che si arrampica lungo i fianchi di una montagna l'orizzonte, pur rimanendo circolare, s'ingrandisce via via che aumenta la quota. Tra le infinite figure geometriche solo la sfera ha la proprietà di apparire circolare, da qualsiasi punto la si osservi.

Nello stesso istante il cielo diurno o notturno appare diverso ad osservatori posti in luoghi diversi della Terra. In particolare, se ci muoviamo verso Sud, le stelle meridionali ci appaiono via via più alte e sempre più basse quelle settentrionali. Viceversa se ci muoviamo verso Nord.

Se due osservatori, in luoghi a diversa longitudine, osservano contemporaneamente il cielo, quello che si trova ad Est vede le stesse stelle in posizione più occidentale dell'altro e viceversa per l'osservatore che si trova più ad Ovest.

Durante le eclissi di Luna l'ombra della Terra, proiettata sul nostro satellite, è circolare. Solo un corpo sferico, comunque illuminato, può proiettare un'ombra sempre circolare.

Anche usando un piccolo telescopio gli altri corpi del sistema solare ci appaiono di forma sferica ed isolati nello spazio. Per analogia questo dovrebbe valere anche per la Terra.

Explanation:

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