Search results
Results from the WOW.Com Content Network
In astronomy or planetary science, the frost line, also known as the snow line or ice line, is the minimum distance from the central protostar of a solar nebula where the temperature is low enough for volatile compounds such as water, ammonia, methane, carbon dioxide and carbon monoxide to condense into solid grains, which will allow their accretion into planetesimals.
The snow line is measured using automatic cameras, aerial photographs, or satellite images. Because the snow line can be established without on-the-ground measurements, it can be measured in remote and difficult to access areas. Therefore, the snow line has become an important variable in hydrological models. [2]
These charts were computer-plotted by the cartographic company of John Bartholomew and Son Ltd. in Edinburgh, Scotland, taking star positions and brightnesses from the most recent version of the Bright Star Catalogue, the successor to the Harvard Revised Photometry. The total number of stars plotted was over 8800, reaching to magnitude 6.5.
In Muslim astronomy, the first star chart to be drawn accurately was most likely the illustrations produced by the Persian astronomer Abd al-Rahman al-Sufi in his 964 work titled Book of Fixed Stars. This book was an update of parts VII.5 and VIII.1 of the 2nd century Almagest star catalogue by Ptolemy .
This print, published in Richard Blome's "The Gentleman's Recreation" (1686) shows the diverse ways in which cosmography can be applied Celestial cartography , [ 1 ] uranography , [ 2 ] [ 3 ] astrography or star cartography [ citation needed ] is the aspect of astronomy and branch of cartography concerned with mapping stars , galaxies , and ...
Two sample pages of the 2002 Nautical Almanac published by the U.S. Naval Observatory. A nautical almanac is a publication describing the positions of a selection of celestial bodies for the purpose of enabling navigators to use celestial navigation to determine the position of their ship while at sea.
Korean Astronomy Book "Selected and Systematized Astronomy Notes" 天文類抄: 1623~1649: Contained some star maps - Ming Dynasty General Star Map (赤道南北兩總星圖) Xu Guangqi and Adam Schall von Bell: 1634-- Ming Dynasty diagrams of Armillary spheres and Celestial Globes: Xu Guangqi: c. 1699-- Ming Dynasty Planetarium Machine (渾象 ...
New 5 in Sagittarius (thus mentioned on chart 22 of Wil Tirion's Sky-Atlas 2000.0, mentioned as ESO 285-G7 on charts 411 and 412 in Uranometria 2000.0 Volume 2, 1987 edition). New 6 in Indus (chart 23 in Tirion's Sky-Atlas 2000.0, chart 413 in the 1987 edition of Uranometria 2000.0, Volume 2) (as ESO 287-G13) NGC — New General Catalogue