Kuhlala kuthethwa ngako Ungcoliseko lokukhanya okanye ukungcoliseka kwefoto xa ukukhanya kwezibane kuninzi kwaye ukuyo yonke indawo kangangokuba kuchaphazela ubumnyama obuqhelekileyo nobunqwenelekayo bobusuku. Ngale ndlela, xa kanye kusihlwa, imithombo emininzi yokukhanya ithatha indawo elangeni kumaziko asezidolophini nakwiidolophu ezincinci.
Abanye oososayensi bayayichaza ngco liseko ukukhanya ezinje nge-infrared, imitha yokukhanya ebonakalayo ekhutshelwe ngaphandle okanye ngaphandle, kwaye ngenxa yolwalathiso lwayo, ubungqongqo kunye nomgangatho, inokuba nefuthe elibi kumntu, kubume bembonakalo yomhlaba, okanye kwindalo.
La ngco liseko ukukhanya Luhlobo longcoliseko olunqabileyo ukuba lukhutshwe ngenxa yokuba alunabungozi kwimpilo, xa kuthelekiswa nongcoliseko lwenkunkuma, umsi wasezidolophini, ilindle, njalo njalo.
Nangona kunjalo, i ngco liseko ukukhanya ineziphumo kwizinto eziphilayo kwaye inokuncitshiswa ngokulula.
Ukusukela ngo-1830, abo banoxanduva lokukhanyisa iParis bakhanyisa isibane esinye sasesitalatweni kubusuku obubodwa benyanga. Umsebenzi onxulumene nenkxalabo yokonga kwaye hayi kangako nge ngco liseko ukukhanya, eyayingabalulekanga kangako. Kutshanje, i-American Dark Sky Association, ethe ukusukela ngo-1988 yenza le nto yaziwa, eyonyuselwe kwinto eyingozi ngokwenene, kwaye yabonakala kakuhle kubo bonke. Ewe amanqaku akhanyayo awayeki ukuphindaphindeka.
Ngo-1992, i UNESCO Iqulethwe kwisibhengezo sayo kumalungelo ezizukulwana ezizayo, icandelo elithile ekunene kulondolozo lwezulu kunye nobunyulu balo. Ngo-2002, iCongress yaseVenice kunye neLucerne zakhupha oorhulumente behlabathi ukuba bakhusele isibhakabhaka ebusuku. Okwangoku Onu ijonge ukuqaphela isibhakabhaka esineenkwenkwezi njengelifa eliqhelekileyo loluntu.
Chonga ungcoliseko lokukhanya
La ngco liseko ukukhanya ibonakala ngokukodwa xa isibhakabhaka sigutyungelwe ngamafu asezantsi, njengoko zibonakalisa kwaye zisasaza ukukhanya kangangeekhilomitha. Ngale ndlela, isibhakabhaka sibonakala simnyama-orenji-pinki. Oku kubonakala ikakhulu kwisihlwele esikhulu. Ngokwesiqhelo, isibhakabhaka kufuneka sibe mnyama ngokupheleleyo, okanye sikhanyiselwe kuphela yinyanga. Xa imozulu icacile, kwaye ngaphandle kwedolophu, i zulwini umnyama kakhulu kunasesixekweni, kwaye ubukho besixeko esikhulu bunokuchongwa ngokulula ngotshintsho kumbala wesibhakabhaka ojika upinki omthubi kwaye ukhanyise.