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HITRAN is a database of spectroscopic parameters regarding the effect of Earth atmosphere's molecules on the absorption and transmission of EMR. It is used in computer models for climate, etc. It was developed in the late 1960s and has been updated a number of times, including 1986, 1991, 1992, 1996, 1998, 2000, 2001, 2004, 2008, 2012, 2016, and 2020, along with on-going additions. HITEMP is an analogous database used for hotter atmospheres (e.g., of stars), specifically about spectral lines present at 1000 K and greater.