An Easy Introduction to Astronomy: For Young Gentlemen and Ladies: Describing The Figure, Motions, and Dimensions of the Earth; the Different Seasons; Gravity and Light; the Solar System; the Transit of Venus, and Its Use in Astronomy; the Moon's Motion and Phases; the Eclipses of the Sun and Moon; the Cause of the Ebbing and Flowing of the Sea, &c. By James Ferguson, F. R. S.