Sentence:  The Planet Earth, so stedfast though she seem, / Insensibly three different Motions move? / Which else to several Sphears thou must ascribe, / Mov'd contrarie with thwart <WSD>obliquities</WSD> 
Meaning of the word marked with <WSD> tags:  The quality of being oblique in direction, deviating from the horizontal or vertical; (or) the angle created by such a deviation. (from 15th c.)