Eclipses have been interpreted as omens or omens. [51] The ancient Greek historian Herodotus wrote that Thales of Miletus predicted a solar eclipse that occurred during a battle between the Medes and the Lydians. Both sides laid down their arms and declared peace in the wake of the eclipse. [52] The exact eclipse remains uncertain, although the subject has been studied by hundreds of ancient and modern authorities. A probable candidate took place on May 28, 585 BC. AD, probably near the Halys River in Asia Minor. [53] A solar eclipse recorded by Herodotus before the departure of Xerxes for his expedition against Greece,[54] traditionally dated to 480 BC. AD, was compared by John Russell Hind to an annular solar eclipse at Sardis on February 17, 478 BC. 55 AD [55] Alternatively, a partial solar eclipse was visible from Persia on October 2, 480 BC. J.-C. [56] Herodotus also reports a solar eclipse in Sparta during the second Persian invasion of Greece.
[57] The date of the eclipse (August 1, 477 BC) does not exactly correspond to the conventional dates of the invasion accepted by historians. [58] John Fiske summarized the myths about the eclipse in his 1872 book Myth and Myth-Makers: The moon`s orbit around the Earth is slightly elliptical, as is the Earth`s orbit around the Sun. The apparent sizes of the Sun and Moon therefore vary. [10] The magnitude of a solar eclipse is the ratio between the apparent size of the moon and the apparent size of the sun during a solar eclipse. A solar eclipse that occurs when the moon is near its closest distance from the Earth (i.e. near its perigee) can be a total solar eclipse because the moon appears large enough to completely cover the bright disc or photosphere of the sun; A total solar eclipse has a luminosity greater than or equal to 1,000. Conversely, a solar eclipse that occurs when the moon is near its farthest distance from Earth (i.e. near its apogee) may be just an annular solar eclipse because the moon appears slightly smaller than the sun; The size of an annular solar eclipse is less than 1. [11] A lunar eclipse is caused by the passage of the moon through the Earth`s shadow. This phenomenon is relatively common, since only two celestial bodies need to be aligned.
Once this happens, half of the Earth – the half that can see the moon at night – can observe the phenomenon. Partial solar eclipse: The moon blocks the sun, but only partially. As a result, part of the sun is visible, while the blocked part appears dark. A partial solar eclipse is the most common type of solar eclipse. Sun; The resulting solar eclipse is annular and observers can see a thin ring of the solar disk around the silhouette of the moon. Phenomena associated with eclipses include shadow bands (also called flying shadows) that look like shadows at the bottom of a pool. They occur only shortly before and after totality, when a narrow crescent of sunlight acts as an anisotropic light source. [85] So why is there no solar eclipse every night when there is a new moon? This is because the new moon must also be near a lunar node.
Between two and five solar eclipses occur each year, with at least one per eclipse season. Since the introduction of the Gregorian calendar in 1582, there have been five solar eclipses in 1693, 1758, 1805, 1823, 1870 and 1935. The next event will be 2206. [42] On average, there are about 240 solar eclipses per century. [43] The myth of Hercules and Cacus, the basic idea is the victory of the sun god over the thief who steals the light. Whether the thief took away the light in the evening, when Indra fell asleep, or boldly raised his black figure against the sky during the day, thus spreading darkness over the earth, would make little difference to the creators of the myth. For a chicken, a solar eclipse is the same as nightfall, and it falls asleep accordingly. Why, then, would the primitive thinker have distinguished between the darkening of the sky by black clouds and the darkening caused by the rotation of the earth? He had no more idea of the scientific explanation of these phenomena than the chicken of the scientific explanation of a solar eclipse.
For him, it was enough for him to know that solar radiation had been stolen, in one or the other, and to suspect that the same demon was responsible for both flights. [65] The solar eclipse on March 20, 2015 was the first occurrence of a solar eclipse estimated to have a significant impact on the electricity system, with the electricity sector taking steps to mitigate the impact. Synchronous zones in continental Europe and the UK were estimated at around 90 gigawatts of solar power and it was estimated that production would temporarily decrease by 34 GW compared to a clear sky day. [98] [99] In principle, the simultaneous occurrence of a solar eclipse and a transit of a planet is possible. However, these events are extremely rare due to their short duration. The next expected simultaneous occurrence of a solar eclipse and transit of Mercury will occur on July 5, 6757, and a solar eclipse and transit of Venus are expected on April 5, 15232. [93] The first known telescope observation of a total solar eclipse was made in France in 1706. [59] Nine years later, English astronomer Edmund Halley accurately predicted and observed the solar eclipse of May 3, 1715. [56] [59] Mitte des 19. In the nineteenth century, scientific understanding of the Sun improved through the observation of the solar corona during solar eclipses.
The corona was identified as part of the solar atmosphere in 1842, and the first photograph (or daguerreotype) of a total solar eclipse was taken of the solar eclipse of July 28, 1851. [56] Spectroscopic observations were made of the solar eclipse of August 18, 1868, which determined the chemical composition of the Sun. [56] The following factors determine the duration of a total solar eclipse (in descending order of importance):[32][33] Since the Earth`s orbit around the Sun is also elliptical, the distance from the Earth to the Sun varies similarly throughout the year. This affects the apparent size of the sun in the same way, but not as much as the different distances from the moon to Earth. [8] As Earth approaches its farthest distance from the Sun in early July, a total solar eclipse is slightly more likely, while conditions favor an annular solar eclipse as the Earth approaches its closest distance from the Sun in early January. [13] A solar eclipse occurs when part of the Earth is wrapped in a moon shadow, which blocks all or part of the sunlight.
