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The lower 5° above the horizon in particular hardly shows any stars (let alone objects) except under the very best conditions. Therefore, a planisphere can fairly accurately be used from +5° to −5° of the design latitude. For example, a planisphere for 40° north can be used between 35° and 45° north.
"there is no convincing evidence that Ptolemy or any of his predecessors knew about the planispheric astrolabe". [14] In chapter 5.1 of the Almagest, Ptolemy describes the construction of an armillary sphere, and it is usually assumed that this was the instrument he used. Astrolabes continued to be used in the Byzantine Empire.
Planisphere or Planisphaerium, a 2nd-century AD book by Claudius Ptolemy about mapping the celestial sphere onto a flat plane using the stereographic projection to make a star chart; Planispheric astrolabe, a device consisting of a planisphere joined to a dioptra, used for observing stars and performing astronomical calculations
The sum of the angles of a spherical triangle is not equal to 180°. A sphere is a curved surface, but locally the laws of the flat (planar) Euclidean geometry are good approximations. In a small triangle on the face of the earth, the sum of the angles is only slightly more than 180 degrees. A sphere with a spherical triangle on it.
This is a measure of the rhumb line distance between the points on the sphere corresponding to A and B on the spherical Earth. Since each degree on the equator corresponds to 60 nautical miles the sailing distance is 3,240 nautical miles for this example. If B is in the second quadrant with respect to A then the upper rose is used and if B is ...
Examples include high-fructose corn syrup, glucose, fructose, and raw sugar. Common sugar-sweetened drinks include soda, fruit juices, bottled iced teas, energy drinks, and sweetened coffee drinks
Guinness Draught (4.2% ABV) Guinness, an Irish Dry Stout, is a fantastic example to disprove a common misconception, that dark beers are higher in alcohol.
What are some examples? Texas Panhandle, 2024. On Feb. 27, 2024, wind gusts from 60 to 70 mph fanned wildfires in the Texas Panhandle into an inferno. Eventually, the Smokehouse Creek wildfire ...