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Solar Eclipse Of January 4, 1973
An annular solar eclipse occurred on January 4, 1973, with an eclipse magnitude of 0.9303. 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. An annular solar eclipse occurs when the Moon's apparent diameter is smaller than the Sun's, blocking most of the Sun's light and causing the Sun to look like an annulus (ring). An annular eclipse appears as a partial eclipse over a region of the Earth thousands of kilometres wide. Annularity was visible from Chile and Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th .... Related eclipses Eclipses in 1973 * An annular solar eclipse on Thursday, 4 January 1973. * A penumbral lunar eclipse on Thursday, 18 January 1973. * A penumbr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Eclipse
A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby obscuring the view of the Sun from a small part of the Earth, totally or partially. Such an alignment occurs during an eclipse season, approximately every six months, during the new moon phase, when the Moon's orbital plane is closest to the plane of the Earth's orbit. In a total eclipse, the disk of the Sun is fully obscured by the Moon. In partial and annular eclipses, only part of the Sun is obscured. Unlike a lunar eclipse, which may be viewed from anywhere on the night side of Earth, a solar eclipse can only be viewed from a relatively small area of the world. As such, although total solar eclipses occur somewhere on Earth every 18 months on average, they recur at any given place only once every 360 to 410 years. If the Moon were in a perfectly circular orbit and in the same orbital plane as Earth, there would be total solar eclipses once a month, at every new moon. Instead, because the Moon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moon
The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of Australia). The Moon is a planetary-mass object with a differentiated rocky body, making it a satellite planet under the geophysical definitions of the term and larger than all known dwarf planets of the Solar System. It lacks any significant atmosphere, hydrosphere, or magnetic field. Its surface gravity is about one-sixth of Earth's at , with Jupiter's moon Io being the only satellite in the Solar System known to have a higher surface gravity and density. The Moon orbits Earth at an average distance of , or about 30 times Earth's diameter. Its gravitational influence is the main driver of Earth's tides and very slowly lengthens Earth's day. The Moon's orbit around Earth has a sidereal period of 27.3 days. During each synodic period ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth
Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surface is made up of the ocean, dwarfing Earth's polar ice, lakes, and rivers. The remaining 29% of Earth's surface is land, consisting of continents and islands. Earth's surface layer is formed of several slowly moving tectonic plates, which interact to produce mountain ranges, volcanoes, and earthquakes. Earth's liquid outer core generates the magnetic field that shapes the magnetosphere of the Earth, deflecting destructive solar winds. The atmosphere of the Earth consists mostly of nitrogen and oxygen. Greenhouse gases in the atmosphere like carbon dioxide (CO2) trap a part of the energy from the Sun close to the surface. Water vapor is widely present in the atmosphere and forms clouds that cover most of the planet. More solar e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apparent Diameter
The angular diameter, angular size, apparent diameter, or apparent size is an angular distance describing how large a sphere or circle appears from a given point of view. In the vision sciences, it is called the visual angle, and in optics, it is the angular aperture (of a lens). The angular diameter can alternatively be thought of as the angular displacement through which an eye or camera must rotate to look from one side of an apparent circle to the opposite side. Humans can resolve with their naked eyes diameters of up to about 1 arcminute (approximately 0.017° or 0.0003 radians). This corresponds to 0.3 m at a 1 km distance, or to perceiving Venus as a disk under optimal conditions. Formula The angular diameter of a circle whose plane is perpendicular to the displacement vector between the point of view and the center of said circle can be calculated using the formula :\delta = 2\arctan \left(\frac\right), in which \delta is the angular diameter, and d is t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annulus (mathematics)
In mathematics, an annulus (plural annuli or annuluses) is the region between two concentric circles. Informally, it is shaped like a ring or a hardware washer. The word "annulus" is borrowed from the Latin word ''anulus'' or ''annulus'' meaning 'little ring'. The adjectival form is annular (as in annular eclipse). The open annulus is topologically equivalent to both the open cylinder and the punctured plane. Area The area of an annulus is the difference in the areas of the larger circle of radius and the smaller one of radius : :A = \pi R^2 - \pi r^2 = \pi\left(R^2 - r^2\right). The area of an annulus is determined by the length of the longest line segment within the annulus, which is the chord tangent to the inner circle, in the accompanying diagram. That can be shown using the Pythagorean theorem since this line is tangent to the smaller circle and perpendicular to its radius at that point, so and are sides of a right-angled triangle with hypotenuse , and the ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chile
Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east and the Pacific Ocean to the west. Chile covers an area of , with a population of 17.5 million as of 2017. It shares land borders with Peru to the north, Bolivia to the north-east, Argentina to the east, and the Drake Passage in the far south. Chile also controls the Pacific islands of Juan Fernández, Isla Salas y Gómez, Desventuradas, and Easter Island in Oceania. It also claims about of Antarctica under the Chilean Antarctic Territory. The country's capital and largest city is Santiago, and its national language is Spanish. Spain conquered and colonized the region in the mid-16th century, replacing Inca rule, but failing to conquer the independent Mapuche who inhabited what is now south-central Chile. In 1818, after declaring in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argentina
Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, the fourth-largest country in the Americas, and the eighth-largest country in the world. It shares the bulk of the Southern Cone with Chile to the west, and is also bordered by Bolivia and Paraguay to the north, Brazil to the northeast, Uruguay and the South Atlantic Ocean to the east, and the Drake Passage to the south. Argentina is a federal state subdivided into twenty-three provinces, and one autonomous city, which is the federal capital and largest city of the nation, Buenos Aires. The provinces and the capital have their own constitutions, but exist under a federal system. Argentina claims sovereignty over the Falkland Islands, South Georgia and the South Sandwich Islands, and a part of Antarctica. The earliest recorded human prese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
January 1973 Lunar Eclipse
A penumbral lunar eclipse took place on Thursday, January 18, 1973, the first of four lunar eclipses in 1973, lasting almost 4 hours. At maximum eclipse, 86.555% of the Moon's disc was partially shaded by the Earth, which caused a slight shadow gradient across its disc; this subtle effect may have been visible to careful observers. No part of the Moon was in complete shadow. The eclipse lasted 3 hours, 56 minutes and 33.7 seconds overall. The Moon was only 2 days after perigee (Perigee on Tuesday, January 16, 1973), making it 3.9% larger than average. At greatest eclipse, the Moon's center was 365,613 km (227,181 mi) from the Earth's center, only 5,613 km (3,488 mi) to be a Super Full Moon. Visibility It was completely visible over North America, South America, the Atlantic Ocean, Europe, Africa, the Indian Ocean, Asia and Australia, seen rising over the Atlantic Ocean and setting over the western North Pacific Ocean. Relation to other lunar eclipses Eclipses in 1973 * An a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
June 1973 Lunar Eclipse
A penumbral lunar eclipse took place on Friday, June 15, 1973, the second of four lunar eclipses in 1973, the first was a penumbral lunar eclipse on Thursday, January 18, the third being with a penumbral lunar eclipse on Sunday, July 15, and the last being with a partial lunar eclipse on Monday, December 10. Visibility Related lunar eclipses Eclipses in 1973 * An annular solar eclipse on Thursday, 4 January 1973. * A penumbral lunar eclipse on Thursday, 18 January 1973. * A penumbral lunar eclipse on Friday, 15 June 1973. * A total solar eclipse on Saturday, 30 June 1973. * A penumbral lunar eclipse on Sunday, 15 July 1973. * A partial lunar eclipse on Monday, 10 December 1973. * An annular solar eclipse on Monday, 24 December 1973. Lunar year series Half-Saros cycle A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, ''The half-saros'' This lunar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Eclipse Of June 30, 1973
A total solar eclipse occurred at the Moon's descending node of the orbit on Saturday, June 30, 1973. 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. With a maximum eclipse of 7 minutes and 3.55 seconds, this was the last total solar eclipse that exceeds 7 minutes in this series. The last total eclipse over 7 minutes was on July 1, 1098 which lasted 7 minutes and 5 seconds. There will not be a longer total solar eclipse until June 25, 2150. The greatest eclipse occurred in the Agadez area in the northwest of Niger not far from Algeria inside the Sahara Desert somewhat 40 km east o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
July 1973 Lunar Eclipse
A penumbral lunar eclipse took place on Sunday, July 15, 1973, the third of four lunar eclipses in 1973. In this extremely marginal eclipse, the Moon barely clipped the edge of the Earth's penumbral shadow. This caused a microscopic darkening of just 10.468% of the Moon's disc for 1 hour, 39 minutes and 8 seconds, which was essentially impossible to see. This event marking the beginning of the 148th saros cycle for a lunar eclipse. The Moon was only 2.6 days after apogee (Apogee on Thursday, July 12, 1973), making it 5.9% smaller than average. Visibility This penumbral eclipse was visible over eastern Asia, Australia, Pacific, western Americas, seen rising over east in Asia, Australia, and setting over the Americas. Relation to other lunar eclipses Eclipses in 1973 * An annular solar eclipse on Thursday, 4 January 1973. * A penumbral lunar eclipse on Thursday, 18 January 1973. * A penumbral lunar eclipse on Friday, 15 June 1973. * A total solar eclipse on Saturday, 30 Jun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
December 1973 Lunar Eclipse
A partial lunar eclipse took place on Monday, December 10, 1973, the last of four lunar eclipses in 1973. At maximum eclipse, a small bite out of the Moon should have been visible. The eclipse lasted for 1 hour, 8 minutes and 29.4 seconds, with just 10.069% of the Moon in shadow at maximum. The Moon was only 0.9 days before perigee (Perigee on the same day at 22:22 UTC), making it 5.8% larger than average. Visibility It was completely visible over North America, Central America, Caribbean, South America, the Atlantic Ocean, Europe, Africa, and central Asia, seen rising over the eastern Pacific Ocean and setting over the western Indian Ocean. As of Equator, it was seen rising over 118th meridian west and setting over the 62nd meridian east. Related lunar eclipses Eclipses in 1973 * Solar eclipse of January 4, 1973, An annular solar eclipse on Thursday, 4 January 1973. * January 1973 lunar eclipse, A penumbral lunar eclipse on Thursday, 18 January 1973. * June 1973 lunar ecl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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