{"id":119,"date":"2020-07-27T17:44:14","date_gmt":"2020-07-27T15:44:14","guid":{"rendered":"http:\/\/www.cosmoespai.com\/cat\/?p=119"},"modified":"2020-07-28T23:08:57","modified_gmt":"2020-07-28T21:08:57","slug":"els-efectes-de-la-lluna-sobre-la-terra","status":"publish","type":"post","link":"https:\/\/www.cosmoespai.com\/cat\/els-efectes-de-la-lluna-sobre-la-terra\/","title":{"rendered":"Els efectes de la Lluna sobre la Terra"},"content":{"rendered":"\n

La Terra i la Lluna formen una parella inseparable. Sota l\u2019efecte d\u2019una for\u00e7a anomenada gravetat, la Terra atreu la Lluna, per\u00f2 la Lluna tamb\u00e9 atreu a la Terra, afectant sobretot als oceans. Aix\u00f2 \u00e9s el que provoca les marees.<\/p>\n\n\n\n

La Lluna i les marees<\/strong><\/u><\/em><\/h4>\n\n\n\n

Dues vegades per dia, el nivell del mar puja i baixa. Aquest moviment de l\u2019aigua \u00e9s el que anomenem la marea. Aquest fenomen el provoca la Lluna, a causa de l\u2019atracci\u00f3 que exerceix sobre la Terra, sobretot en els oceans. Quan la Lluna est\u00e0 a l\u2019altre costat de la Terra, l\u2019aigua baixa, fent baixar el nivell del mar i deixant la costa al descobert. A aix\u00f2 se li diu marea baixa. Llavors, quan la Lluna torna a passar, tota l\u2019aigua torna a pujar, a causa de l\u2019atracci\u00f3 que la Lluna exerceix, i tornar a caure sobre la costa, fent pujar el nivell del mar.<\/p>\n\n\n\n

Per estrany que sembli, tamb\u00e9 hi ha marees terrestres. Sense que ens en adonem, el terra que nosaltres trepitgem puja de 30 a 40 cm sota els nostres peus, i despr\u00e9s torna a baixar! Aquest tipus de marea tamb\u00e9 est\u00e0 provocat per la Lluna, com ja he explicat anteriorment, a causa de la seva atracci\u00f3 sobre la Terra.<\/p>\n\n\n\n

L\u2019alternan\u00e7a de les marees altes i de les marees baixes \u00e9s degut a que la Terra gira sobre el seu eix en 24 hores, per aix\u00f2 la Lluna no est\u00e0 sempre a dalt del mateix lloc.<\/p>\n\n\n\n

Les grans marees<\/strong><\/u><\/em><\/h4>\n\n\n\n
\"\"<\/figure>\n\n\n\n

El Sol tamb\u00e9 exerceix una atracci\u00f3 sobre la Terra, tot i que m\u00e9s fluixa que la de la Lluna. Quan els tres cossos celestes estan alineats a l\u2019anomenada Lluna nova, aix\u00ed com a la Lluna plena, representat a les dos parts de dalt de la imatge, l\u2019atracci\u00f3 de la Lluna i del Sol se sumen, fent que durant aquell per\u00edode de temps les marees siguin m\u00e9s fortes.<\/p>\n\n\n\n

Al contrari, quan la Lluna i el Sol no \u00abestiren\u00bb en la mateixa direcci\u00f3, representat a les dues parts de baix de la imatge, les marees s\u00f3n m\u00e9s febles.<\/p>\n\n\n\n

Un incre\u00efble efecte<\/strong><\/u><\/em><\/h4>\n\n\n\n

La constant atracci\u00f3 de la Lluna, que fa pujar i baixar el nivell dels oceans, aix\u00ed com el nivell del terra, fa que el nostre planeta giri cada vegada m\u00e9s a poc a poc sobre el seu eix. Aquesta desacceleraci\u00f3 del gir de la Terra sobre el seu eix provoca un allargament dels dies (fa 900 milions d\u2019anys els dies nom\u00e9s duraven 18h), i un distanciament progressiu de la Lluna respecte a la Terra de 3,8 cm per any.<\/p>\n","protected":false},"excerpt":{"rendered":"

La Terra i la Lluna formen una parella inseparable. Sota l\u2019efecte d\u2019una for\u00e7a anomenada gravetat, la Terra atreu la Lluna, per\u00f2 la Lluna tamb\u00e9 atreuContinuar llegint<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":121,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":""},"categories":[69],"tags":[94,95,73,91,92,90,96,93],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2020\/07\/Efectes_Lluna.jpg?fit=720%2C405","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":611,"url":"https:\/\/www.cosmoespai.com\/cat\/per-que-a-la-muntanya-fa-mes-fred-que-al-nivell-del-mar\/","url_meta":{"origin":119,"position":0},"title":"Per qu\u00e8 a la muntanya fa m\u00e9s fred que al nivell del mar?","author":"Ferran","date":"22 d'abril de 2022","format":false,"excerpt":"\u00c9s sabut per tothom que al nivell del mar hi ha una temperatura m\u00e9s c\u00e0lida que al cim d\u2019una muntanya. 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