User:TerrainAhead/sandpit

Application in measuring redshift
https://books.google.co.uk/books?id=xNnx_sWZuGEC&pg=PA153&dq=infrared+Ca+II+triplet&hl=en&sa=X&redir_esc=y#v=onepage&q=infrared%20Ca%20II%20triplet&f=false

https://books.google.co.uk/books?id=hEFQh5lzcowC&pg=PA224&dq=infrared+Ca+II+triplet&hl=en&sa=X&redir_esc=y#v=onepage&q=infrared%20Ca%20II%20triplet&f=false