出典:Wiktionary
出典:『Wiktionary』 (2013/05/18 03:04 UTC 版)
astro- + chronology
astrochronology (uncountable)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/21 18:06 UTC 版)
Astrochronology is the dating of sedimentary units by calibration with astronomically tuned timescales, such as Milankovic cycles, or even sunspot cycles. When used in concert with radiometric dating, it allows the resolution of timescales to a high degree of accuracy.