Présentation de l'éditeur
There are some questions in A stronomy, to which we are attracted rather on account of their peculiarity, as the possible illustration of some unknown principle, than from any direct advantage which their solution would afford to mankind. The theory of theM oons inequalities, though in its first stages it presents theorems interesting to all students of mechanics, has been pursued into such intricacies of calculation as can be followed up only by those who make the improvement of theL unar Tables the object of their lives. The value of the labours of these men is recognised by all who are aware of the importance of such tables in Practical Astronomy and Navigation. The methods by which the results are obtained are admitted to be sound, and we leave to professional astronomers the labour and the merit of developing them. The questions which are suggested by the appearance of Saturn sR ings cannot, in the present state of A stronomy, call forth so great an amount of labour among mathematicians. I am not aware that any practical use has been made of Saturn sR ings, either in Astronomy or inN avigation. They are too distant, and too insignificant in mass, to produce any appreciable effect on the motion of other parts of theS olar system ;and for this very reason it is difficult to determine those elements of their motion which we obtain so accurately in the case of bodies of greater mechanical importance. But when we contemplate the Rings from a purely scientific point of view, they become the most remarkable bodies in the heavens, except, perhaps, those still less useful bodies the spiral nebulae. When we have actually seen that great arch swung over the equator of the planet without any visible connexion, we cannot bring our minds to rest. We cannot simply admit that such is the case, and describe it as one of the observed facts in nature, not admitting or req
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Présentation de l'éditeur
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