-17 , ( Copernicus) , . , (Kepler) , . , , (Brahe). , . , . , . . , . , -900 , -70 ! , , . , . , . . , ' (Napier) "", . , 10 x, log(x), 10 x. , log(100)=2, 100 = 102, 10 100. " " 100 -1,000: 10,… [+545 chars]