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A treatise on astronomy, descriptive, physical and practical. Designed for schools, colleges, and private students (1849)

Robinson, Horatio N. (Horatio Nelson), 1806-1867 · Albany, N.Y., E.H. Pease & Co.; [etc., etc.] · leaf 175

An illustration from A treatise on astronomy, descriptive, physical and practical. Designed for schools, colleges, and private students, 1849, leaf 175 — n philosophy, and a principlegeometrically demonstrated, that any force or influence exist- mPhllos°Ph?ing at a point, must diminish as it spreads over a largerspace, and in proportion to the increase of space. But spaceincreases as the square of linear distance, as we see by Fig. 28. 160… … the distance. Therefore, any influence spreading in all di-rections from its central point must be enfeebled as the squareof the distance.The theory Erom observations and considerations like these, Newtongravity. established the all-important and now universally admittedtheory of gravity. This…

Astronomy

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