|
dog days
dog days name for the most sultry period of summer, from about July 3 to Aug. 11. Named in early times by observers in countries bordering the Mediterranean, the period was reckoned as extending from 20 days before to 20 days after the conjunction of Sirius (the dog star) and the sun. In the lati...
Read more
|
|
|
period
period unit of time on the geologic timescale . Periods are shorter than an era and longer than an epoch. Periods are of variable length, generally lasting tens of millions of years, with characteristic fossils found preserved in the sediments deposited during the period. It is also used to design...
Read more
|
|
|
Periodic Table of the Elements: Hydrogen
Periodic Table of the Elements: Hydrogen
Periodic Table of the Elements: Hydrogen
Atomic Number:
1
Atomic Symbol:
H
Hydrogen
Atomic Weight:
1.00794
Electron
Configuration:
1
...
Read more
|
|
|
Eliza (Fowler) Haywood
Eliza (Fowler) Haywood 1693?-1756, English author. Separated from her husband, she supported herself and her two children by writing plays and novels. Two of her books, Utopia (1725) and The Court of Carmania (1727), scandalized well-known society figures, and earned her the disapproval of Pope...
Read more
|
|
Silurian period
Silurian period [from the Silures, ancient tribe of S Wales, where the period was first studied; named by the British geologist R. I. Murchison], third period of the Paleozoic era of geologic time (see Geologic Timescale , table) lasting from 405 to 435 million years ago. The continents in the S...
Read more
|
|
|
Minoan civilization
Minoan civilization , ancient Cretan culture representing a stage in the development of the Aegean civilization . It is named for the legendary King Minos of Crete. The culture was divided by Sir Arthur Evans into three periods that include the whole of the Bronze Age: Early Minoan (c.3000 BC-220...
Read more
|
|
|
Tertiary period
Tertiary period , name for the major portion of the Cenozoic era , the most recent of the geologic eras (see Geologic Timescale , table) from around 26 to 66 million years ago. The name Tertiary was first applied about the middle of the 18th cent. to a layer of deposits, largely unconsolidated s...
Read more
|
|
|
Tertiary period
Tertiary period , name for the major portion of the Cenozoic era , the most recent of the geologic eras (see Geologic Timescale , table) from around 26 to 66 million years ago. The name Tertiary was first applied about the middle of the 18th cent. to a layer of deposits, largely unconsolidated s...
Read more
|
|
day
day period of time for the earth to rotate once on its axis. The ordinary day, or solar day, is measured relative to the sun, being the time between successive passages of the sun over a stationary observer's celestial meridian . The length of a solar day varies during the course of a year, so f...
Read more
|
|
physical fitness
physical fitness combined good health and physical development. The object of any program of physical fitness is to maximize an individual's health, strength, endurance, and skill relative to age, sex, body build, and physiology. These ends can only be realized through conscientious regulation of e...
Read more
|
