The World's Supply of Energy

Svante Arrhenius
1920 Scientific American  
OCTUBER, 1920 SOIENTIFIC AMERICAN MONTHLY 103 puint to' be ubserved, are nut So' fulfilled, and cunsequently the sensatiun uf the green rays can be ubtained in the murning unly by sustained attentiun preceded by systematic study. In the Arctic regiDns the phenumenun is capable uf assuming a special aspect when the sun strikes the hurizun at a very sharp angle. Even in a given latitude and un a given day the sun tDuches the hurizun fur a periud uf time amuunting to' several minutes. Thus, if the
more » ... nutes. Thus, if the atmusphere is pure the physical causes may be dissuciated frum the physiulugical causes and the green ray may appear as a mure durable phenumenDn but with a manifestly diminished brilliance. Pussibly it has been ubserved, in any case, huwever, it is gDverned by rigid cDnditiDns Df place, time, and atmDspheric purity. In many cases Dne Dbserves Dnly what Dne knDws Dught to' Dccur; the physical reality Df a durable green ray being knDwn to' be a fact under the cDnditiDns just described, we are justified in believing that any clDse Dbserver will have the privilege Df cDnfirming its existence.
doi:10.1038/scientificamerican10011920-103supp fatcat:cuhmdw5ybravxjzb3gbopehy2e