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== Referensi ==
{{Reflist|2|refs=
<ref name=AO>{{cite web|title=Earth's shadow|publisher = www.atoptics.co.uk |author =Les Cowley|url = http://www.atoptics.co.uk/atoptics/earshad.htm|access-date=2018-01-06|archive-date=2020-12-19|archive-url=https://web.archive.org/web/20201219085648/https://www.atoptics.co.uk/atoptics/earshad.htm|dead-url=yes}}</ref>
<ref name=earth-shadow>{{cite book|title=Color and light in nature|author= David K. Lynch, William Charles Livingston|url = https://books.google.com/books?id=4Abp5FdhskAC&pg=PA38&lpg=PA38&dq=earth+shadow+color+and+light+in+nature&source=bl&ots=bN3UHSoym0&sig=DIeWBajGeM4ecoPW1KKNmhLyaV0&hl=en&ei=pFe8TLjoLJGqsAPcsemzDw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBIQ6AEwAA#v=onepage&q=earth%20shadow%20color%20and%20light%20in%20nature&f=false|page = 38,39|publisher=Cambridge University Press; 2 edition |date=July 2001|ISBN=978-0-521-77504-5}}</ref>
<ref name="earth's shadow">{{cite web|title=What causes layers in the sunrise and sunset?|publisher = earthsky.org |url = http://www.webexhibits.org/causesofcolor/14E.html}}</ref>