[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-636249-105":3,"detail-sidebar-cat-0-en-105":84,"doc-detail-636249-en":134},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":77,"head_meta":79,"extra_data":81,"updated_unix":83},105,"en","47-eclipses-of-the-sun-and-moon","4.7 Eclipses of the Sun and Moon","","Explains why solar and lunar eclipses occur, starting from the near-equal apparent sizes of the Sun and Moon and the resulting shadow effects. Describes Earth and Moon shadow structure using umbra and penumbra, and how different shadow positions produce total, partial, or annular solar eclipses. Covers eclipse seasons driven by the Moon’s tilted orbit, then details geometry, visibility, eclipse path width, shadow motion speed, and totality limits, followed by lunar-eclipse conditions and frequency differences.",{"@graph":14,"@context":76},[15,34,55],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/research-report/","Research & Report",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/47-eclipses-of-the-sun-and-moon/636249/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/47-eclipses-of-the-sun-and-moon/636249.png","ImageObject",300,407,{"name":42,"@type":43},"McQueen","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-01","2026-10-22",true,{"@type":52,"interactionType":53,"userInteractionCount":33},"InteractionCounter",{"@type":54},"ViewAction",{"@type":56,"mainEntity":57},"FAQPage",[58,64,68,72],{"name":59,"@type":60,"acceptedAnswer":61},"Why do the Sun and Moon produce eclipses from Earth?","Question",{"text":62,"@type":63},"Their apparent sizes are nearly the same in the sky because the Sun is much larger but also much farther away. That makes the Moon capable of covering the Sun from Earth when their paths align.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"What are umbra and penumbra in eclipse geometry?",{"text":67,"@type":63},"The umbra is the darkest cone of a shadow, while the penumbra is a lighter, more diffuse region. The eclipse type depends on whether an observer is in the umbra or penumbra.",{"name":69,"@type":60,"acceptedAnswer":70},"How does eclipse season affect when eclipses can happen?",{"text":71,"@type":63},"The Moon’s orbit is tilted relative to Earth’s orbital plane, so eclipses are avoided in most months. When the two paths cross twice a year, “eclipse season” begins and eclipses become possible.",{"name":73,"@type":60,"acceptedAnswer":74},"Why are lunar eclipses seen more frequently from a given place than solar eclipses?",{"text":75,"@type":63},"A lunar eclipse is visible to everyone who can see the Moon and can be observed from the entire night side of Earth. A solar eclipse is only visible within a narrow eclipse path, so local opportunities are rarer.","https://schema.org",{"og:url":32,"og:type":78,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":80,"canonical":32},"index,follow",{"doc_id":82,"site_id":7},636249,1792811920,{"code":4,"msg":85,"data":86},"success",[87,91,95,99,104,109,114,118,123,126,130],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":88,"show_sort_weight":89,"slug":90},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":92,"show_sort_weight":93,"slug":94},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":96,"show_sort_weight":97,"slug":98},"Exam",70,"exam",{"id":100,"doc_module":4,"doc_module_name":25,"category_name":101,"show_sort_weight":102,"slug":103},5,"Comic",60,"comic",{"id":105,"doc_module":4,"doc_module_name":25,"category_name":106,"show_sort_weight":107,"slug":108},6,"Technology",50,"technology",{"id":110,"doc_module":4,"doc_module_name":25,"category_name":111,"show_sort_weight":112,"slug":113},7,"Healthcare",40,"healthcare",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":116,"slug":117},8,30,"research-report",{"id":119,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":121,"slug":122},9,"Religion & Spirituality",20,"religion-spirituality",{"id":121,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":121,"slug":125},"World Cup","world-cup",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":127,"slug":129},10,"Lifestyle","lifestyle",{"id":131,"doc_module":4,"doc_module_name":25,"category_name":132,"show_sort_weight":100,"slug":133},19,"General","general",{"code":4,"msg":85,"data":135},{"doc_id":82,"user_id":136,"nickname":42,"user_avatar":137,"doc_module":4,"category_id":115,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":138,"file_id":139,"file_url":140,"file_type":141,"file_size":142,"view_count":33,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":33,"language":143,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":144,"faqs":145,"seo_title":146,"seo_description":12,"update_tm":147,"read_time":127},5909890329169,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","4.7 ECLIPSES OF THE SUN AND MOON  \nOne of the coincidences of living on Earth at the present time is that the two most prominent astronomical objects, the Sun and the Moon, have nearly the same apparent size in the sky. Although the Sun is about 400 times larger in diameter than the Moon, it is also about 400 times farther away, so both the Sun and the Moon have the same angular size—about 1/2° . As a result, the Moon, as seen from Earth, can appear to cover the Sun, producing one of the most impressive events in nature.  \nAny solid object in the solar system casts a shadow by blocking the light of the Sun from a region behind it. This shadow in space becomes apparent whenever another object moves into it. In general, an eclipse occurs whenever any part of either Earth or the Moon enters the shadow of the other. When the Moon’s shadow strikes Earth, people within that shadow see the Sun at least partially covered by the Moon; that is, they witness a solar eclipse. When the Moon passes into the shadow of Earth, people on the night side of Earth see the Moon darken in what is called a lunar eclipse. Let’s look at how these happen in more detail.  \nThe shadows of Earth and the Moon consist of two parts: a cone where the shadow is darkest, called the umbra, and a lighter, more diffuse region of darkness called the penumbra. As you can imagine, the most spectacular eclipses occur when an object enters the umbra. Figure 4.21 illustrates the appearance of the Moon’s shadow and what the Sun and Moon would look like from different points within the shadow.  \nFigure 4.21 Solar Eclipse. (a) The shadow cast by a spherical body (the Moon, for example) is shown. Notice the dark umbra and the lighter penumbra. Four points in the shadow are labeled with numbers. In (b) you see what the Sun and Moon would look like in the sky at the four labeled points. At position 1, you see a total eclipse. At positions 2 and 3, the eclipse is partial. At position 4, the Moon is farther away and thus cannot cover the Sun completely; a ring of light thus shows around the Sun, creating what is called an “annular” eclipse.  \nIf the path of the Moon in the sky were identical to the path of the Sun (the ecliptic), we might expect to see an eclipse of the Sun and the Moon each month—whenever the Moon got in front of the Sun or into the shadow of Earth. However, as we mentioned, the Moon’s orbit is tilted relative to the plane of Earth’s orbit about the Sun by about 5° (imagine two hula hoops with a common center, but tilted a bit) . As a result, during most months, the Moon is sufficiently above or below the ecliptic planeto avoid an eclipse. But when the two paths cross (twice a year), it is then “eclipse season” and eclipses are possible.  \nEclipses of the Sun  \nThe apparent or angular sizes of both the Sun and Moon vary slightly from time to time as their distances from Earth vary. (Figure 4.21 shows the distance of the observer varying at points A–D, but the idea is the same. ) Much of the time, the Moon looks slightly smaller than the Sun and cannot cover it completely, even if the two are perfectly aligned. In this type of “annular eclipse,” there is a ring of light around the dark sphere of the Moon.  \nHowever, if an eclipse of the Sun occurs when the Moon is somewhat nearer than its average distance, the Moon can completely hide the Sun, producing a total solar eclipse. Another way to say it is that a total eclipse of the Sun occurs at those times when the umbra of the Moon’s shadow reaches the surface of Earth.  \nThe geometry of a total solar eclipse is illustrated in Figure 4.22. If the Sun and Moon are properly aligned, then the Moon’s darkest shadow intersects the ground ata small point on Earth’s surface. Anyone on Earth within the small area covered by the tip of the Moon’s shadow will, for a few minutes, be unable to see the Sun and will witness a total eclipse. At the same time, observers on a larger area of Earth’s surface who are in the penumbra ","cbCaidYxMdxBYIjH","https://ap.wps.com/l/cbCaidYxMdxBYIjH","pdf",394563,"English","# Eclipses of the Sun and Moon\n## Sun and Moon apparent size and shadow casting\n## Types of solar eclipses (annular, total, partial)\n## Eclipse season and orbital geometry\n## Geometry and visibility of total solar eclipses\n## Lunar eclipses (total vs partial)","[{\"question\":\"Why do the Sun and Moon produce eclipses from Earth?\",\"answer\":\"Their apparent sizes are nearly the same in the sky because the Sun is much larger but also much farther away. That makes the Moon capable of covering the Sun from Earth when their paths align.\"},{\"question\":\"What are umbra and penumbra in eclipse geometry?\",\"answer\":\"The umbra is the darkest cone of a shadow, while the penumbra is a lighter, more diffuse region. The eclipse type depends on whether an observer is in the umbra or penumbra.\"},{\"question\":\"How does eclipse season affect when eclipses can happen?\",\"answer\":\"The Moon’s orbit is tilted relative to Earth’s orbital plane, so eclipses are avoided in most months. When the two paths cross twice a year, “eclipse season” begins and eclipses become possible.\"},{\"question\":\"Why are lunar eclipses seen more frequently from a given place than solar eclipses?\",\"answer\":\"A lunar eclipse is visible to everyone who can see the Moon and can be observed from the entire night side of Earth. A solar eclipse is only visible within a narrow eclipse path, so local opportunities are rarer.\"}]","4.7 Eclipses of the Sun and Moon | PDF",1792677836]