Kusukela kudala, abantu bebelokhu befuna ukwazi ngokwemvelo. Ubelokhu ezama ukukala nokuqonda ubude nobukhulu bezinto ukuze afunde okwengeziwe ngeplanethi yethu. Esinye sezici ezihlale ziyimpicabadala kumuntu yi Irediyasi yomhlaba. Njengoba singakwazi ukubhoboza oqweqweni loMhlaba futhi siye emnyombweni, kufanele sifunde ukulinganisa nokubala indawo engaba yiplanethi. Ngenxa yososayensi abathile abadale imodeli yokulinganisa lobu bude, kuye kwenzeka ukubulinganisa ngokunemba okwandayo. Ngaphezu kwalokho, i- imisebe yelanga lokho okufinyelela eMhlabeni nakho kuyisici esifanelekile uma kuziwa ekuqondeni ukuguquguquka kweplanethi.
Kulesi sihloko sizokutshela ukuthi iyini indawo yoMhlaba nokuthi ilinganiswe kanjani.
Izinkinga zokulinganisa i-radius yoMhlaba
Njengoba sazi, yize ubuchwepheshe buthuthuke ngamanani amakhulu, iplanethi yethu isenezinto eziningi ezingaziwa. Kunezindawo eziningi zeplanethi ezingafinyeleleki kubantu. Isibonelo salokhu ulwandle. Abusekho ubuchwepheshe obukwazi ukunqoba ingcindezi yamanzi kanye nokukhanya okuncane kwelanga okutholakala emiseleni yasolwandle. Kunjalo nasenkabeni yoMhlaba. Maningi amanoveli achaziwe ngohambo oluya enkabeni yoMhlaba kodwa yinto namanje esingakwazi ukuyifinyelela. Engikwaziyo kakhulu ukwazile ukumba ngokujula kube cishe amakhilomitha ayi-12. Lokhu nje ukuphakamisa isikhumba esincane se-apula.
Njengoba umnyombo woMhlaba ungenakumbiwa, kuye kwadingeka kutholwe izindlela ezihlukene zokulinganisa indawo engaba yi-Earth. Esinye sezizathu eziyinhloko zokuthi kungani ukumba kuze kufike enkabeni yoMhlaba kungenakwenzeka ungqimba oluphakeme lwamadwala aqinile, amelana. Ubuchwepheshe obuphezulu abukwazi ukubhoboza kuwo wonke la makhilomitha e-deep rock. Esinye isici esiwumphumela izinga lokushisa lomgogodla woMhlaba. Futhi ingaphakathi core is at izinga lokushisa cishe ngama-5000 degrees Celsius. Ebhekene nokushisa okunjalo, akekho umuntu noma yimuphi umshini ongamelana nalezi zimo. Okokugcina, kula manzi akukho umoya-mpilo ongaphefumula.
Naphezu kwazo zonke lezi zinkinga ekulinganiseni i-radius yoMhlaba ngokuqondile, isintu simile. Kutholwe amamodeli ahlukene ukulinganisa inani lawo. Isibonelo, ungasebenzisa i- amagagasi okuzamazama komhlaba ukuze bakwazi ukufunda ukwakheka kwezingqimba zangaphakathi zomhlaba. Lezi zindlela zinganquma ngokungaqondile ukujula lapho ukuzamazama komhlaba kwenzeka khona. Singafunda ngezici ezihlukahlukene zeplanethi ngaphandle kokubona yonke into ngamehlo ethu. Lokhu kungaba usizo ukuqonda ukuthi kanjani Umnyombo womhlaba kanye nomthelela wayo ezimeni zemvelo.
Plate tectonics theory kanye ne-Eratosthenes
Umbono weplate tectonics usize kakhulu ekuqondeni ukuthi iplanethi isebenza kanjani. Isigaxa sezwekazi kuthiwa sehlukaniswe ngamacwecwe e-tectonic ahamba ngokuqhubekayo. Isizathu sokufuduka kungenxa ye- imibukiso ye-convection kwengubo yoMhlaba. Lokhu kuhamba kwamapuleti kwaziwa ngu igama lokukhukhuleka kwezwekazi. Ngaphezu kwalokho, le thiyori ibalulekile ekuqondeni ukuthi amapuleti e-tectonic aziphatha kanjani kanye nobudlelwano bawo ne ukuzamazama komhlaba.
Ama-convection currents esembathweni soMhlaba abangelwa umehluko wokuminyana okhona phakathi kwezinto ezingaphakathi kwawo. Singakwazi konke lokhu ngenxa yezinhlobo ezahlukene zezindlela zokulinganisa ezingaqondile. Besilokhu sifuna izindlela ezahlukene zokuthola izilinganiso zayo yonke into. Usosayensi wokuqala owakwazi ukukala ububanzi bomhlaba kwakungu-Eratosthenes. Lesi silinganiso besilokhu sinabantu abasolayo kusukela ezikhathini zasendulo.
Ngaleso sikhathi kwakungekho buchwepheshe obuningi obutholakalayo ukukala ubukhulu bomhlaba. Ngakho-ke, le ndlela yokuqala yayiqukethe izinto ezithile zobudlova kakhulu. Khumbula ukuthi, ngalesi sikhathi, lezi zindlela zobudoda zazithathwa njengobuchwepheshe bokuguqula isimo. Enye yezinto ezibaluleke kakhulu ezazisetshenziselwa ukukala irediyasi yoMhlaba kwakuwukubaluleka kwe- I-Summer Solstice.
U-Eratosthenes wathatha i-papyrus emtatsheni wezincwadi futhi waphawula ukuthi isigxobo esasikuwo asizange senze thunzi, okwakubangelwa ukuthi imisebe yelanga ishaya phezu komhlaba ngokuphelele. Lesi yisizathu esenza u-Eratosthenes wayenelukuluku lokwazi ukuthi iyiphi indawo yoMhlaba. Indlela yokulinganisa i-radius yoMhlaba kwaba kamuva lapho eya e-Alexandria. Lapha ngangiphindaphinda ukuhlola futhi ngibone ukuthi isithunzi selanga sasiyi-7 degrees. Ngemva kwalesi silinganiso, waqaphela ukuthi umehluko nesinye isithunzi esasihlala eSiena kwakuyisizathu sokwazi ukuthi uMhlaba wawuyindilinga futhi awusicaba njengoba kwakukholelwa ngaleso sikhathi. Lokhu kuhlobene nocwaningo lwezigigaba ezehlukene njengalezo ezingabangelwa a isivunguvungu selanga.
Ifomula ye-Eratosthenes yokukala irediyasi yoMhlaba
Lapho eseqede izivivinyo eziningana, wathola okuhlangenwe nakho okuningana kwalezi zilinganiso. Ukusuka lapho, waqala ukwakha imibono embalwa eyasiza ukukala indawo yoMhlaba. Iningi lenqubo lalisuselwa ekulinganisweni nasekubanjweni kwemali. Ukudonswa kwakhe okuyinhloko kwakususelwa eqinisweni lokuthi uma uMhlaba ubunguzungezo lwe-360 degree, ingxenye eyodwa kwengamashumi ayisihlanu yalowo mkhawulo ingaba ama-degree ayi-7. Le ngxenye yomjikelezo ophelele yilokho okwalinganiswa ngomthunzi e-Alexandria.
Ngokwazi ukuthi ibanga eliphakathi kwamadolobha amabili aseSiena ne-Alexandria lalingamakhilomitha angama-800, wakwazi ukukuthola lokho indawo yoMhlaba yayingu-6.371 km. Khumbula ukuthi, ngenkathi ngibala ama-Eratosthenes, kwakunzima kakhulu ukuthola izilinganiso kahle. Kodwa-ke, unikeze izibalo eduze kakhulu nokwaziwa namuhla.
Namuhla kunezinye izindlela zokukala ingaphakathi lomhlaba sibonga amagagasi okuzamazama komhlaba. Kuye ngezinto ezenziwe ngaphakathi kanye nebanga ukusuka enkabeni yokuzamazama komhlaba, ukujula kunganqunywa.
Ngiyethemba ukuthi ngalolu lwazi ungafunda kabanzi mayelana nokuthi ingakanani indawo yoMhlaba nokuthi yalinganiswa kanjani okokuqala ngqa.