the terrestrial rotation period
1The Wizard of Oz (1939 film) — The Wizard of Oz Theatrical release poster Directed by Victor Fleming Uncredited: Norman Taurog Richard Thorpe …
2Geology of the Moon — The geology of the Moon (sometimes called selenology, although the latter term can refer more generally to lunar science ) is quite different from that of the Earth. The Moon lacks a significant atmosphere and any bodies of water, which… …
3Encyclopedia of the Brethren of Purity — The Encyclopedia of the Brethren of Purity (Arabic: رسائل أخوان الصفا و خلان الوفا Rasa il ikhwan as safa wa khillan al wafa; also variously known as the Epistles of the Brethren of Sincerity , Epistles of the Brethren of Purity and Epistles of… …
4Formation and evolution of the Solar System — Artist s conception of a protoplanetary disk The formation and evolution of the Solar System is estimated to have begun 4.568 billion years ago with the gravitational collapse of a small part of a giant molecular cloud …
5Antiquity of the World — Antiquity of the World † Catholic Encyclopedia ► Antiquity of the World Various attempts have been made to establish the age of the world. Two groups of scientists have especially busied themselves with this question: physicists and… …
6History of the Earth — For the history of modern humans, see History of the world. Geological time put in a diagram called a geological clock, showing the relative lengths of the eons of the Earth s history The history of the Earth describes the most important events… …
7List of gravitationally rounded objects of the Solar System — Objects in the Solar System By orbit By size By discovery date …
8Cretaceous Period — Interval of geologic time from с 144 to 65 million years ago. During the Cretaceous the climate was warmer than today. In the seas, marine invertebrates flourished, and bony fishes evolved. On land, flowering plants arose, and insects, bees in… …
9Ordovician Period — Interval of geologic time, 490–443 million years ago, the second oldest period of the Paleozoic Era. It follows the Cambrian and precedes the Silurian. During the Ordovician, many of the landmasses were aligned in the tropics. Life was dominated… …
10Science and mathematics from the Renaissance to Descartes — George Molland Early in the nineteenth century John Playfair wrote for the Encyclopaedia Britannica a long article entitled ‘Dissertation; exhibiting a General View of the Progress of Mathematics and Physical Science, since the Revival of Letters …
