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2017 Total Solar Eclipse Stamp
The United States Postal Service issued the Total Eclipse of the Sun Forever stamp on June 20, 2017. The stamp includes two superimposed images, one showing a total solar eclipse and the second showing a full moon that is revealed upon heat being applied. This stamp commemorates the solar eclipse of August 21, 2017 which was visible across the continental United States from coast to coast, weather permitting. Details In the first U.S. stamp application of thermochromic ink, the Total Eclipse of the Sun Forever stamps reveal a second image. By rubbing a thumb or finger on the image, the heat imparted will cause an underlying image of the full moon to be revealed. Afterward, the image reverts to the dark image as it cools. The US Postal Service notes that exposure to ultraviolet (UV) light causes degradation of thermochromic inks, so the eclipse stamps should be shielded from sunlight to preserve their thermochromic behavior. To help with this, the Postal Service sends panes of thi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Eclipse Of March 29, 2006
A total solar eclipse occurred on March 29, 2006. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. A total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide. It was visible from a narrow corridor which traversed half the Earth. The magnitude, that is, the ratio between the apparent sizes of the Moon and that of the Sun, was 1.052, and it was part of Saros 139. It was the second solar eclipse visible in Africa in just 6 months. Visibility The path of totality of the Moon's shadow began at sunrise in Brazil and extended across the Atlantic to Africa, traveling across Ghana, the southeastern tip of Ivory Coast, Togo, Benin, Nigeria, Niger, Cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denomination (postage Stamp)
In philately, the denomination is the "inscribed value of a stamp". The denomination is not the same as the value of a stamp on the philatelic market, which is usually different, and the denominations of a country's stamps and money do not necessarily match. For instance, there might be a 47c stamp to pay a particular postal rate but there is unlikely to be a 47c coin. No denomination shown Where no denomination is shown, it may be because the stamp is deliberately non-denominated to pay the cost of a particular service, or because the stamp is not a postage stamp. It might be a cinderella stamp of some kind such as a poster stamp or charity label. Letter-denominated first-class stamps : Faced in 1978 with the problem of supplying stamps to satisfy an anticipated postal rate increase that had not yet been specifically determined, the United States Postal Service issued a stamp bearing the letter "A" instead of a numerical denomination, announcing that this stamp would cover w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Philatelic Society
The American Philatelic Society (APS) is the largest nonprofit stamp collecting foundation of philately in the world. Both the membership and interests of the society are worldwide. History The organization, originally named the ''American Philatelic Association'', was established on September 14, 1886 in New York City, and the following day elected John K. Tiffany as its first president. Voting membership was granted to 219 individuals who paid two bits (25¢) for the privilege. The organization's name was changed to its present name for a few months in 1897, then back, then permanently in 1908. Society membership reached over 4,000 in 1940, and included U.S. President Franklin D. Roosevelt and his Secretary of the Interior Harold L. Ickes. At the 1942 APS convention, board member Donald Lybarger argued for the creation of a central office near the geographic center of the philatelic community, but not in a large city. When he was elected APS President in 1943, he was able to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pressure-sensitive Adhesive
Pressure-sensitive adhesive (PSA, self-adhesive, self-stick adhesive) is a type of nonreactive adhesive which forms a bond when pressure is applied to bond the adhesive with a surface. No solvent, water, or heat is needed to activate the adhesive. It is used in pressure-sensitive tapes, labels, glue dots, stickers, sticky note pads, automobile trim, and a wide variety of other products. As the name "pressure-sensitive" indicates, the degree of bond is influenced by the amount of pressure which is used to apply the adhesive to the surface. Surface factors such as smoothness, surface energy, removal of contaminants, etc. are also important to proper bonding. PSAs are usually designed to form a bond and hold properly at room temperatures. PSAs typically reduce or lose their tack at low temperatures and reduce their shear holding ability at high temperatures; special adhesives are made to function at high or low temperatures. Structural and pressure-sensitive adhesives Adhesives ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexandria, Virginia
Alexandria is an independent city (United States), independent city in the northern region of the Commonwealth (U.S. state), Commonwealth of Virginia, United States. It lies on the western bank of the Potomac River approximately south of Downtown, Washington, D.C., downtown Washington, D.C. In 2020, the population was 159,467. The city's estimated population has grown by 1% annually since 2010 on average. Like the rest of Northern Virginia and Central Maryland, modern Alexandria has been influenced by its proximity to the U.S. capital. It is largely populated by professionals working in the United States federal civil service, federal civil service, in the U.S. Military, U.S. military, or for one of the many private companies which contract to Government contractor, provide services to the federal government. One of Alexandria's largest employers is the United States Department of Defense, U.S. Department of Defense. Another is the Institute for Defense Analyses. In 2005, the U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astrophysics
Astrophysics is a science that employs the methods and principles of physics and chemistry in the study of astronomical objects and phenomena. As one of the founders of the discipline said, Astrophysics "seeks to ascertain the nature of the heavenly bodies, rather than their positions or motions in space–''what'' they are, rather than ''where'' they are." Among the subjects studied are the Sun, other stars, galaxies, extrasolar planets, the interstellar medium and the cosmic microwave background. Emissions from these objects are examined across all parts of the electromagnetic spectrum, and the properties examined include luminosity, density, temperature, and chemical composition. Because astrophysics is a very broad subject, ''astrophysicists'' apply concepts and methods from many disciplines of physics, including classical mechanics, electromagnetism, statistical mechanics, thermodynamics, quantum mechanics, relativity, nuclear and particle physics, and atomic and m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NASA
The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeeding the National Advisory Committee for Aeronautics (NACA), to give the U.S. space development effort a distinctly civilian orientation, emphasizing peaceful applications in space science. NASA has since led most American space exploration, including Project Mercury, Project Gemini, the 1968-1972 Apollo Moon landing missions, the Skylab space station, and the Space Shuttle. NASA supports the International Space Station and oversees the development of the Orion spacecraft and the Space Launch System for the crewed lunar Artemis program, Commercial Crew spacecraft, and the planned Lunar Gateway space station. The agency is also responsible for the Launch Services Program, which provides oversight of launch operations and countdown management f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth & Sky
''Earth & Sky'' was a daily radio series that presented information about science and nature. It began broadcasting in 1991 and ceased operations in 2013. ''EarthSky'' is the ongoing website, serving 21 million users in 2019, according to Google Analytics. ''Earth & Sky'' was the creation of producers Deborah Byrd and Joel Block, who were also the hosts. Byrd had previously created the radio program '' Star Date'' that began broadcasting in the US in 1978, and Block was ''Star Dates original host. ''Earth & Sky'' presented 60- and 90-second radio spots (called "modules") on a wide variety of scientific topics, communicating through terrestrial radio as well as satellite radio and internet radio. ''Earth & Sky'' was aired one or more times daily on more than 1,000 commercial, NPR, and other public radio stations, 80 affiliate stations for the sight-impaired, and across 35 channels on both XM and Sirius satellite radio in the United States. Abroad, the programming iwas heard o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portal, Arizona
Portal is an unincorporated community in Cochise County, Arizona, United States. It lies south-southeast of San Simon and at the mouth of Cave Creek Canyon on the east side of the Chiricahua Mountains. Often called the Yosemite of Arizona, the rock walled canyon is composed of fused volcanic tuff. The community is a popular location for birding in southeastern Arizona. It is also home to the American Museum of Natural History's Southwest Research Station. The ranch of Sally and Walter R. Spofford was a popular birdwatching destination before closing in 2002. Other notable residents include the writer Nancy Farmer and her husband. The Arizona Sky Village astronomy community is located in Portal, because the skies in the area are free of light pollution and therefore extremely dark. Climate Typical of upland Arizona, Portal has a semi-arid climate (Köppen ''BSk'') with warm to hot days followed generally by quite cool nights. Frequent frost Frost is a thin layer of ic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Toledo
The University of Toledo (UToledo or UT) is a public research university in Toledo, Ohio. It is the northernmost campus of the University System of Ohio. The university also operates a Health Science campus, which includes the University of Toledo Medical Center, in the West Toledo neighborhood of Toledo; a satellite campus in the Scott Park neighborhood of Toledo; the Center for the Visual Arts is located in downtown Toledo at the Toledo Museum of Art; and a research and education facility, known as the Lake Erie Center, at Maumee Bay State Park. The university was founded in 1872 in downtown Toledo as the Toledo University of Arts and Trades. It closed after six years. The city of Toledo took it over, reopening it in 1884 as the Toledo Manual Training School. The vocational school was developed as a university through the late 1800s. In 1931 the university moved to its current location in the Ottawa neighborhood. Since its establishment, the university has physically exp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fred Espenak
Fred Espenak is a retired emeritus American astrophysicist. He worked at the Goddard Space Flight Center. He is best known for his work on eclipse predictions. He became interested in astronomy when he was 7–8 years old, and had his first telescope when he was around 9–10 years old. Espenak earned a bachelor's degree in physics from Wagner College, Staten Island, where he worked in the planetarium. His master's degree is from the University of Toledo, based on studies he did at Kitt Peak Observatory of eruptive and flare stars among red dwarfs. He was employed at Goddard Space Flight Center, where he used infrared spectrometers to measure the atmospheres of planets in the Solar System. He provided NASA's eclipse bulletins since 1978. He is the author of several canonical works on eclipse predictions, such as the ''Fifty Year Canon of Solar Eclipses: 1986–2035'' and ''Fifty Year Canon of Lunar Eclipses: 1986–2035'', both of which are standard references on eclipses ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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