🚀 Breaking: partial solar eclipse – The Shocking Truth You Didn’t Know!
Key Overview
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 Earth, totally or partially. Such an alignment occurs approximately every six months, during the eclipse season in its new moon phase, when the Moon's orbital plane is closest to the plane of 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.
Types
Types
The Sun's distance from Earth is about 400 times the Moon's distance, and the Sun's diameter is about 400 times the Moon's diameter. Because these ratios are approximately the same, the Sun and the Moon as seen from Earth appear to be approximately the same size: about 0.5 degree of arc in angular measure. The Moon's orbit around Earth is slightly elliptical, as is Earth's orbit around the Sun.
Occurrence and cycles
Occurrence and cycles
A total solar eclipse is a rare event, recurring somewhere on Earth every 18 months on average, yet is estimated to recur at any given location only every 360–410 years on average. The total eclipse lasts for only a maximum of a few minutes at any location because the Moon's umbra moves eastward at over 1700 km/h (1100 mph; 470 m/s; 1500 ft/s).
Viewing
Viewing
Looking directly at the photosphere of the Sun (the bright disk of the Sun itself), even for just a few seconds, can cause permanent damage to the retina of the eye, because of the intense visible and invisible radiation that the photosphere emits. This damage can result in impairment of vision, up to and including blindness.
Historical eclipses
Historical eclipses
Historical eclipses are a very valuable resource for historians, in that they allow a few historical events to be dated precisely, from which other dates and ancient calendars may be deduced.
Particular observations, phenomena and impact
Particular observations, phenomena and impact
A total solar eclipse provides a rare opportunity to observe the corona (the outer layer of the Sun's atmosphere). Normally this is not visible because the photosphere is much brighter than the corona. According to the point reached in the solar cycle, the corona may appear small and symmetric, or large and fuzzy. It is very hard to predict this in advance.
Recent and forthcoming solar eclipses
Recent and forthcoming solar eclipses
Eclipses occur only in the eclipse season, when the Sun is close to either the ascending or descending node of the Moon. Each eclipse is separated by one, five or six lunations (synodic months), and the midpoint of each season is separated by 173.3 days, which is the mean time for the Sun to travel from one node to the next.
See also
See also
Lists of solar eclipses List of films featuring eclipses Apollo–Soyuz: First joint U.S.–Soviet space flight. Mission included an arranged eclipse of the Sun by the Apollo module to allow instruments on the Soyuz to take photographs of the solar corona.
Bibliography
Bibliography
Mucke, Hermann; Meeus, Jean (1992). Canon of Solar Eclipses −2003 to +2526 (2 ed.). Vienna: Astronomisches Büro. Harrington, Philip S. (1997). Eclipse! The What, Where, When, Why and How Guide to Watching Solar and Lunar Eclipses. New York: John Wiley and Sons. ISBN 0-471-12795-7. Steel, Duncan (1999). Eclipse: The celestial phenomenon which has changed the course of history. London: Headline.
External links
External links
NASA Eclipse Web Site, with information on future eclipses and eye safety information NASA Eclipse Web Site (older version) Eclipsewise, Fred Espenak's new eclipse site Andrew Lowe's Eclipse Page, with maps and circumstances for 5000 years of solar eclipses A Guide to Eclipse Activities for Educators, Explaining eclipses in educational settings Detailed eclipse explanations and predictions, Hermi.
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