BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Talks.cam//talks.cam.ac.uk// X-WR-CALNAME:Talks.cam BEGIN:VEVENT SUMMARY:On the history of celestial mechanics\, climate models and the ‘ Pacemaker of the Ice Ages’ paper of 1976: Some lessons on the relations between models\, mathematics and data from the empirical climate sciences - Richard Staley (University of Cambridge) DTSTART:20250501T091500Z DTEND:20250501T101500Z UID:TALK230395@talks.cam.ac.uk DESCRIPTION:Milutin Milankovitch&rsquo\;s mathematical theory of climate i s surely one of the most important underpinnings to our understanding the ice ages\, but the historiography of the climate sciences has largely been dominated by analyses of public debate and studies of climate models\, wi th particularly important contributions to the latter from Amy Dahan-Dalme dico\, Matthias Heymann and Paul Edwards. Rather than considering Milankov itch&rsquo\;s hypotheses about the significance of changes in the earth&rs quo\;s orbit for the timing of ice ages itself\, this paper studies the 19 76 &lsquo\;Pacemaker of the Ice Ages&rsquo\; paper that was widely taken t o confirm it\, both as another episode in the long-term history of the rel ations between celestial mechanics and the physical sciences\, and for wha t it reveals about the many different ways that climate has been modelled. Reflecting on the work of the Making Climate History project I have been engaged in recently\, I will approach the collaboration of James D. Hays\, John Imbrie and Nick Shackleton (and his research assistant Mike Hall)\, as one instance of longstanding searches for cycles governing relations be tween sun and earth (something taken up particularly by André\; Berg er in this period)\; and to consider the models of time they developed to make sense of sediment cores deposited over hundreds of thousands of years . This is an account of how the imprint of sun and climate&mdash\;sea temp erature and sea level&mdash\;were found in sludge composed largely of the tests of foraminifera. LOCATION:Seminar Room 1\, Newton Institute END:VEVENT END:VCALENDAR