By J. L. E. Dreyer
A masterpiece of old perception and clinical accuracy, this can be the definitive paintings on Greek astronomy and the Copernican Revolution. starting with the traditional Egyptians, it levels from the Pythagoreans and Plato to medieval eu and Islamic cosmologies, concluding with detailed surveys of the works of Copernicus, Brahe, and Kepler.
Formerly titled: background of the Planetary platforms from Thales to Kepler
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Additional info for A History of Astronomy from Thales to Kepler (2nd Edition) (Dover Books on Astronomy)
7). In later chapters I discuss these physical interactions in greater detail. Ultimately, the ring-moons may also provide the material for future rings and be the repository of past ring material (see Chapter 10). 9 Saturn’s G ring as seen in a high-resolution Hubble image taken on October 14, 1996. The top right region displays the background-subtracted G ring itself. For guidance, the bold white lines mark (in order of increasing radius) the A ring outer edge, the F ring, and the mean radius of the G ring.
3 6 × 10−6 8 × 10−6 ? <1 <1 <1 <1 <1 <1 <1 <1 >95 <1 <1 <1 ? 5 ? ? 0 ? 41 000–43 000 53 000 (W = 10 km) 53 000–58 000 57 200 (W = 100 km) 62 930 (W = 50 km) 62 930 (W = 10 km) 4–10 × 10−5 10−2 1–3 × 10−4 ? 10–2 10−1 ? 4–70 ? 2–50 4–70 ? ? ? , 1991; Porco and Hamilton, 2007. 2 A Galileo view of the Jovian ring, showing both the main ring and the halo’s outer parts, processed in three different ways to highlight various features. (a) Stretched to differentiate the main ring’s diffuse inner periphery versus its much crisper outer boundary.
Figure courtesy of Judith K. Burns, updated by Doug Hamilton and by the author. From Burns et al. (2001), Dusty rings and circumplanetary dust. In Interplanetary Dust, ed. E. Gr¨un, B. A. S. Gustafson, S. F. Dermott, and H. Fechtig. Berlin: Springer-Verlag, pp. ) ? 5 ? ) ? 15 5–100 <3 <3 <3 ? 5 Many density waves Narrow, broad components Arc, coincident with Aegaeon Peak near Enceladus The particles may coat Iapetus leading hemisphere 10−4 −10−3 10−3 ? 37 000–39 500 37 850–41 350 Power-law index ?