Lectures on astronomical theories . perpendicularityat the nodal plane, descends below that plane,the conditions are reversed; the north pole andnorthern regions will be attracted towards the sun, andthe south polar regions recede in an equal ratio. What reasonable ground have we for tentativelyaccepting such assumption I (1.) That such a vibration of the earth is probable andnatural; from the known relation of force and motionthere must be a tendency to such vibration, and, unlessentirely counteracted by the effect of the earths rotationon its axis the tendency must result in an appreciableei
Lectures on astronomical theories . perpendicularityat the nodal plane, descends below that plane,the conditions are reversed; the north pole andnorthern regions will be attracted towards the sun, andthe south polar regions recede in an equal ratio. What reasonable ground have we for tentativelyaccepting such assumption I (1.) That such a vibration of the earth is probable andnatural; from the known relation of force and motionthere must be a tendency to such vibration, and, unlessentirely counteracted by the effect of the earths rotationon its axis the tendency must result in an appreciableeifect. (2) The careful astronomical observations made by , from the year 1725 to 1727, and which led tohis adoption and proposition of the theory of think that the results of those observations affordstrong evidence in favour of, and may go far towardsdemonstrating, a libration of the earth such as supposedabove. Fig. 9 is a sectional illustration of the earths (or otherplanets) vertical motion thus LECTURE SECOND. PARALLAX AND ABERRATION OF LIGHT JOHN HARRIS
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Keywords: ., bookcentury18, bookdecade1870, booksubjectastronomy, bookyear1876
