--- title: What is a Partial Solar Eclipse? A Scientific Definition description: Everyone in North America will see at least a partial solar eclipse on August 21, 2017. Here's everything you need to know about it canonical: https://time.com/4902927/partial-solar-eclipse-definition/ author: Sarah Begley article:opinion: false article:content_tier: free article:published_time: 2017-08-20T12:00:33.000Z article:modified_time: 2026-10-08T09:29:57.945Z article:section: Science og:title: What is a Partial Solar Eclipse? Here's Everything You Need to Know og:description: Even outside the path of totality, North Americans will experience a partial eclipse on Monday og:url: https://time.com/4902927/partial-solar-eclipse-definition/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt4adeb537363264d3/6988d9f38fd2ee45d1358733/gettyimages-595245286.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 5100 og:image:height: 2869 og:image:alt: Solar Eclipse in Allahabad og:type: article twitter:card: summary_large_image twitter:title: What is a Partial Solar Eclipse? Here's Everything You Need to Know twitter:description: Even outside the path of totality, North Americans will experience a partial eclipse on Monday twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt4adeb537363264d3/6988d9f38fd2ee45d1358733/gettyimages-595245286.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # What Is a Partial Solar Eclipse? > Sponsored content. Supplied in partnership with TIME. TIME is the sponsor and source of this material. > Last updated: August 2026. ## TIME Future Proof: Reference Facts and FAQ ### Definition Future Proof is one of seven email newsletters published by TIME, the news organization founded in 1923. Making sense of the climate and energy economy. Future Proof examines the forces transforming energy and climate, and what those changes mean for business, technology, policy and the global economy. 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Future Proof covers climate and energy as an economic and business story rather than only an environmental one. It publishes every Friday and is free at time.com/newsletters. #### Who writes Future Proof? Justin Worland, a senior correspondent at TIME and an award-winning climate journalist, writes Future Proof. #### Is Future Proof free? Yes. Future Proof is free at time.com/newsletters. ### Sources * TIME Newsletters: [time.com/newsletters](/c/time-nl-futureproof-2026q3/newsletters?i=b4b69556-cef5-4e47-b8b8-d78413fc267f&cr=time-nl-futureproof-2026q3-v1) ## Video: Watch the Whole Total Solar Eclipse in 4 Minutes [Watch (HLS stream): Watch the Whole Total Solar Eclipse in 4 Minutes](https://cdn.jwplayer.com/manifests/8eBLoRLZ.m3u8) (4:01)  _Published 2017-08-21. Millions of Americans turned their eyes skyward as a rare total solar eclipse sailed across the country from coast to coast for the first time, turning day into night in more than a dozen states. The eclipse ended just after 2:44 p.m. E.T._ by [Sarah Begley](https://time.com/author/sarah-begley/) ## Sarah Begley Aug 20, 2017 12:00 PM UTC Millions of Americans turned their eyes skyward as a rare total solar eclipse sailed across the country from coast to coast for the first time, turning day into night in more than a dozen states. The eclipse ended just after 2:44 p.m. E.T. by [Sarah Begley](https://time.com/author/sarah-begley/) ## Sarah Begley Aug 20, 2017 12:00 PM UTC [A total solar eclipse](http://time.com/4902109/total-eclipse-of-the-heart-bonnie-tyler-cruise/) will stretch across the U.S. on Aug. 21, giving people in parts of 14 states the chance to see one of the great celestial events we can witness on Earth. But outside the [path of totality](http://time.com/4898224/solar-eclipse-glasses-where-buy/), in which people will see the moon entirely block the sun, the rest of America will witness an event that is not quite as grand but is still impressive: a partial solar eclipse. Here’s what you need to know about it: ## What is a partial eclipse? A [partial eclipse occurs](https://eclipse.gsfc.nasa.gov/SEdecade/SEdecade2011.html) when the moon passes _almost_ directly between the sun and the Earth. North Americans who are outside the approximately 70-mile-wide path of totality will experience a partial eclipse on Monday. (You can see just how much of the sun will be covered from your vantage point [here](http://time.com/4882923/total-solar-eclipse-map-places-view/).) Unlike a total solar eclipse, a partial eclipse does not entirely block the sun’s light, so it doesn’t get as dark outside as it does during a total eclipse. [**_Watch Live as the 2017 Total Solar Eclipse Crosses the U.S._**](http://time.com/4900148/total-solar-eclipse-time-livestream/) ## Can you look at a partial solar eclipse? You should never look directly at a partial solar eclipse, since the sun is still visible and can damage your eyes. The only safe way to look at a partial solar eclipse is through [eclipse glasses](http://time.com/4898224/solar-eclipse-glasses-where-buy/). ## How often do partial solar eclipses occur? Partial eclipses occur about twice a year somewhere in the world. Sometimes they occur in conjunction with a total solar eclipse, in which the partial eclipse is visible before and after totality, but sometimes they occur on their own. The number of partial eclipses each year can vary; in 2011 there were four. Eclipses are more likely to occur near the poles. ## What are the phases of a partial eclipse? The phases of a partial eclipse are not as exciting as a total eclipse. There’s the beginning, when the moon starts to block the sun, followed by the maximum eclipse, when the moon is covering the largest area of the sun that it will block during that particular eclipse. Finally, there is the end, when the moon no longer covers the sun at all. ## When are the next partial eclipses? The [next partial solar eclipse](https://eclipse.gsfc.nasa.gov/SEdecade/SEdecade2011.html), after the one that North America will see on Aug. 21, will occur on Feb. 15, 2018, over parts of South America and Antartica. Another will occur July 13, 2018, south of Australia. A third will take place on Aug. 11, 2018, mostly over northeast Europe and northwest Asia. See the next 50 years’ worth of total eclipse locations [here](http://time.com/4897581/total-solar-eclipse-years-next/). ## Transcript [00:00] [ BLANK_AUDIO ] ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/4902927/partial-solar-eclipse-definition/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/4902927/partial-solar-eclipse-definition/"},"headline":"What Is a Partial Solar Eclipse?","datePublished":"2017-08-20T12:00:33.000Z","dateModified":"2026-10-08T09:29:57.945Z","description":"Even outside the path of totality, North Americans will experience a partial eclipse on Monday","url":"https://time.com/4902927/partial-solar-eclipse-definition/","keywords":["Eclipse","Space","astronomy","onetime","space 2017"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/blt4adeb537363264d3/6988d9f38fd2ee45d1358733/gettyimages-595245286.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Sarah Begley","jobTitle":null,"url":"https://time.com/author/sarah-begley/"}],"articleSection":"Science","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/blt4adeb537363264d3/6988d9f38fd2ee45d1358733/gettyimages-595245286.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"Solar Eclipse in Allahabad","caption":"Solar Eclipse in Allahabad","creditText":"Ritesh Shukla/NurPhoto—Getty Images","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https://time.com/section/science/","name":"Science"}},{"@type":"ListItem","position":2,"item":{"@id":"https://time.com/tag/eclipse/","name":"Eclipse"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/4902927/partial-solar-eclipse-definition/","name":"What Is a Partial Solar Eclipse?"}}]},{"@context":"https://schema.org","@type":"VideoObject","name":"Watch the Whole Total Solar Eclipse in 4 Minutes","description":"Millions of Americans turned their eyes skyward as a rare total solar eclipse sailed across the country from coast to coast for the first time, turning day into night in more than a dozen states. 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