ct to tion, knos obliquity,precession, and eccentricity, over long periods of time. Milankovitcbe a relationsy  t lengtely 20,000,40,000, and 100,000 years, but varying in eaco a fe t determining ts of intersection over long spans of time involved a nearlyendless amount of devoted computation. Essentially Milankovitco  tion of incoming solar radiation at every latitude on Earted for three ever-changing variables.

    of repetitive toil t suited Milankovitcemperament. For t ty years, even ables of  noed ina day or ter. tions all o be made in ime, but in1914 Milankovitc a great deal of t o ion as a reservist in t most of tfour years under loose  in Budapest, required only to report to t of ime   prisoner of war in ory.

    tual  outcome  of   scribblings icalClimatology and tronomical tic Cc ttionsary  people  it  led to t eorologist, ladimir K?ppen—fatectonic friend Alfred egener—le, and rat.

    to be found in cool summers, not brutal ers.

    If summers are too cool to melt all t falls on a given area, more incoming sunligive surface, exacerbating t and encouraging yetmore snoo fall. tend to be self-perpetuating. As snoedinto an ice s, ting more ice to accumulate. As t G is not necessarily t of sno causes icess but t t snole, lasts.” It is t t an ice age could startfrom a single unseasonal summer. tover snos  and exacerbates t. “toppable, and once tmoves,” says McPhee. You have advancing glaciers and an ice age.

    In t dating tecists o correlateMilankovitc c