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Questions tagged [solar-eclipse]

Questions about the complete or partial blocking of the sun by the moon.

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Solar and lunar eclipses — how rare

I was fortunate enough to see the solar eclipse in southern Illinois last year. The clouds were not friendly, but we did have one spectacular moment of perfect eclipse. It is an eerie sensation, and I ...
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How does an eclipse differ from an occultation?

A comment in response to this question suggests that an eclipse differs from an occultation in that the former casts a shadow while the latter doesn't. This isn't particularly satisfactory since ...
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Would an extremely bright star produce same kind of shadow band effect as seen in solar eclipses just before totality?

This answer explains that the shimmering patterns seen on surfaces at the moment before totality of a solar eclipse are called shadow bands, and that the phenomenon is closely related to the twinkling ...
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What is causing this strange shimmering pattern of light during a total solar eclipse?

Below this question was left a comment linking to the Smarter Every Day video Space Station Transiting 2017 ECLIPSE, My Brain Stopped Working - Smarter Every Day 175. At about ...
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Calculate eclipse days and duration of satellite

If a satellite is revolving in a GEO orbit, then what will be the eclipse duration for it? How to calculate when the satellite will enter the dark side of the Earth? Any formula or online tool would ...
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Are Saros series separated by “40” in numbering related in any way?

Can anyone help with this question? My question arose from an eclipse related observation that I made while looking into lunar Saros series 129. It is the Saros series number for the lunar eclipse ...
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The total number of solar eclipses in a century repeats roughly every 6th century

We know that on a longer time scale (millions of years) the orbits of planes are unstable and it is impossible to make predictions about eclipses millions of years into the future. But on a shorter ...
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What would cause large jumps in brightness during a solar eclipse?

This question on Physics SE about apparent brightness during a solar eclipse has a log-scale graph of light intensity versus time. Parts of it are the shape I'd expect: a nearly-smooth curve going ...
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Spacing (2422 days) between solar eclipses - unrelated saros numbers

I just made an observation that is very puzzling. The observation concerns total solar eclipses and their spacing in time. I know that the saros cycle dictates recurrence of same saros eclipses ...
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How often do partial solar eclipses of 90% of totality occur in same place?

I know that the mean interval between total eclipses in a single place is about 375 years, which is not surprising given the small band of area of the totality. However, the penumbra of the eclipse ...
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Is it possible that a satellite creates a forever eclipse? [closed]

So, to add a bit of context, I’m doing the NaNoWriMo challenge, which consists of writing a novel of 50k words in one month. My whole idea is based around the following question: What would happen if ...
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How did Halley combine newton’s lunary theory with the saros cycle to predict eclipses?

I’ve read that halley combined Newton’s lunar motion model with the old knowledge of the saros cycle to predict eclipses. Unfortunately I can’t find any source that shows exactly how he did this, ...
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Eclipses with SkyField

I'm trying to compute solar eclipses for a long period of time, see Back-predicting solar eclipses Initially, I wanted at several points on Earth whether an eclipse was visible at some point in time. ...
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Mountains on the moon during solar eclipse?

I ask myself the reason of why the sun in not uniform on the edge of the moon at this moment of the eclipse (cf. picture) is not unifom is because of the mountains of the moon ? Or can it due to ...
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A real light source, or an artifact?

I was taking shots of the 2017 eclipse using my D7200 camera with a 1000 ND filter. As I was going through the pictures after downloading them to a pc, I noticed that there's what appears to be a tiny ...
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Dark enough to see stars during total solar eclipse?

I was fortunate enough to see totality during the eclipse of 2017 August 21. It did leave me wondering about the 1919 Eddington experiment, though. During totality, it only got dark enough to see a ...
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What prevents consequent eclipses? [duplicate]

I know there are a number of parameters that determine the occurrence of a solar or lunar eclipse. The number should be 18; 6 degrees of freedom for 3 rigid bodies. But can't figure out why eclipses ...
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What happens to a sundial during a solar eclipse?

Would the shadow cast by the gnomon change direction during a solar eclipse? If there is indeed a change in direction of the shadow, by how many degrees would it be? I'm asking because i read ...
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How to tell between annular and total eclipse (directly)?

An annular eclipse is similar to total eclipse except our Moon "apparently" appears smaller than the Sun, my question is since in both cases there will be a glowing ring forming... so how to tell them ...
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Why don't multiple eclipses happen over the course of a few days?

From my understanding over the course of the seasons the moon and sun rise at varying locations. Though the day to day differences are no noticeable, to me at least. For instance, in the summer, the ...
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Long term temperature effects of an eclipse

I was surprised to see a very measurable difference in temperature at my home during the recent solar eclipse. The temperature was about 93 degrees fahrenheit but dropped to around 86 degrees. It ...
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On the day of total solar eclipse why was early sunrise observed in India?

I am a middle school teacher from India(UTC+5:30). On August 21, 2017 morning at (17.385044, 78.486671) we observed an unusually early sunrise. It felt like its 7'O clock in the morning at 5:45 AM. ...
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Why do some solar eclipses' umbra cross arctic/antarctic regions?

The ecliptic (Earth's orbital plane) is inclined 23.4 degrees. This is the same as Earth's axial tilt. The Moon's orbit is inclined 5.145 degrees to the ecliptic. Therefore, the maximum latitude ...
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Does the sky darken proportionally during a partial solar eclipse?

During a solar eclipse, some of the visible area of the sun is obscured by the moon. The exact percentage varies with time and with the observer's location. My question is, does the sky darken by ...
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Why is it okay to watch a sunset but not an eclipse?

People watch sunsets all the time. You don't see people using special "sunset glasses". Yet with an eclipse, warnings are posted everywhere not to view it without special glasses. Why is this?
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Why didn't it seem darker outside with 66% of the sun covered by the moon? [duplicate]

I live in Austin, TX where the eclipse on August 21, 2017 reached its maximum point with ~66% of the sun covered by the moon. Why didn't it seem any darker than a normal time with 0% eclipse?
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How much of the sun needs to be blocked in order to see a noticeable drop in brightness

I live in NYC and just experienced the eclipse. What fascinated me the most was that despite the fact that the sun was about 70% blocked, the area was not noticeably dimmer. If the news wasn't saying ...
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Eclipse Visible Light Not Dark as Expected

I live in a place where we weren't on the path of totality but were in the 90% range. I was expecting it to be a lot darker than it ended up being. What does it mean to be in the 90% range on this map?...
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Can Astronauts Aboard ISS See the Shadow of The Moon on The Earth During an Eclipse?

I was wondering if the astronauts on the ISS are able to see the shadow from the moon on the earth at all during the eclipse.
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2017 solar eclipse report

I'm writing a report about the solar eclipse happening over north America and was wondering why looking at a solar eclipse is worse than looking at the sun regularly. In addition what alternate ...
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Is it safe to view a solar eclipse with eyeglasses along with eclipse glasses?

In an article on Ars Technica about safely viewing a solar eclipse, they say this: First, what not to do: Don’t view the eclipse with your naked eye or unfiltered telescopes, binoculars, sunglasses ...
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How much does cloud cover affect viewing the total eclipse

As I look for a spot for viewing the total eclipse, how much will cloud cover affect the viewing experience? Is there a threshold list like: Under x % won't have a noticeable difference Over x % you ...
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Taking a picture the solar eclipse in a bucket of water

I want to capture the eclipse in a bucket of water. Now, the problem is proportion. The sun will look like a little marble in standing water. How would I magnify the size of the sun so the sun ...
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Why does the path of the moon in an eclipse curve (relative to the sun)

Reviewing several simulations of the solar eclipse, it is apparent that the path of the moon relative to the sun curves. Using https://www.timeanddate.com/eclipse/in/usa/kansas-city?iso=20170821 for ...
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Might someone see changes to the corona during a solar eclipse?

I've seen many pictures of the corona during a solar eclipse, and the structure and delicacy is amazing. Clearly, the appearance would change over time, depending on the fine details of the solar wind ...
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Where can I still find solar film?

I, like many others, am excited to see the eclipse. I want to view the eclipse through my telescope, however, I don't have any solar safety equipment for solar viewing and I cannot find any online ...
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Will you be able to see the corona in a 90%+ partial eclipse? [duplicate]

I live in Champaign, Illinois (see map) and am planning to watch the August 21st solar eclipse. This community is within the 95% totality range, but not within the path of totality. Will I be able to ...
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Will I be able to see the “Beads of Baily” at 99%+ totality?

Where I am (Vancouver, WA), the Sun will be 99%+ covered. Will I be able to see the "Beads of Baily" when the sun is 99%+ covered in my area ? Downtown Portland, OR is expected to be 99.4% (according ...
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How can I tell if my solar glasses are up to ISO standards?

Like many, we bought solar glasses to view the eclipse, and are now in a strange place where we can't tell if they're safe or not. The big fuss seems to be about ISO 12312-2 compliance. Apparently ...
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Can you test solar eclipse glasses with a remote control?

By putting solar eclipse glasses directly between a remote control IR emitter and device receiver, could some unsafe glasses be detected? My guess is most fake glasses are just blocking visible light ...
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Is the sun any brighter during a solar eclipse

I keep hearing that you can go blind during a solar eclipse. Is the sun actually any brighter during a solar eclipse? This is how the media seems to frame it, and they suggest you need special ...
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Why my simulation of eclipse 2017 is wrong! [closed]

I made a simulation of total eclipse 2017 in Kansas city by StarryNight5.0 software and this software shows this eclipse will not be total in this city. Web sites says it is total. Where I was wrong ...
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What does a solar eclipse at 99% totality look like?

People smarter than me say the sun will be 99% covered during the 2017 solar eclipse where I live (Portland, OR metro). I am curious to know what it might look like (photo or drawing). Does this photo ...
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Choosing an eclipse viewing location

I have chosen to view the eclipse at roughly the intersection of I95 and eclipse path (Santee, SC). It was suggested that I arrive early to get a good spot: sage advice given that all the hotels are ...
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2017 Eclipse intersection with I-95

I am excited to see the 2017 eclipse in South Carolina and would like to understand where exactly the eclipse-path intersects I-95, so that I can plan a day-trip. I have approximated at roughly ...
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Solar Telescope Projector Screen? [& intro telescope for solar eclipse]

I don't know very much about telescopes; I used one a few times as a kid, but that's about it. I understand the general design & use of reflectors & refractors, but I don't know enough to ...
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Why shouldn't you look at the Sun through a camera using eclipse glasses?

One of the NASA approved eclipse glasses manufacturers has the following warning on one of their eclipse glasses: Do NOT look through a camera, telescope or binoculars with ANY eclipse shades on! ...
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How to test direct sun viewing glasses

I purchased a 10 pack of glasses for viewing the upcoming eclipse. They show to be ISO 12312-2:2015 certified. How can this be tested and verified?
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Why are three year old eclipse glasses not recommended?

NASA's eclipse safety page says that eclipse glasses should: Not be used if they are older than three years, or have scratched or wrinkled lenses Why shouldn't three year old glasses be used? Is ...
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What is the large astronomical instrument shown in this 1918 eclipse expedition photo?

This nice video musing about (among other things) the US Naval Observatory's $3,500 expedition to Baker City or at least Baker County Oregon to observe the June 18, 1918 solar eclipse, there is a ...