Questions tagged [eclipse]

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What is the logic behind the Eddington expedition that proved Einstein's general theory of relativity?

The Eddington expedition in 1919 proved Einstein's general theory of relativity. [Eddington] argued that the deflection, or bending, of light by the Sun’s gravity could be measured... because ...
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1answer
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Definition of eclipsing binaries?

In the second minimum (the 3rd step) there is a smaller decrease in light intensity. For this to happen, wouldn't you need to be looking at the plane of orbit from above rather than directly along the ...
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1answer
47 views

Why eclipses are not periodic?

From mathematics, we know that if any two or more functions are periodic in nature, their combination would also be periodic in nature with some exceptions. Since motions of the sun, the moon and the ...
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1answer
38 views

What is the derivation of this formula for eclipsed flux?

From my lecture notes: Planetary Transit Searches If a planetary system’s orbital plane lies along our line of sight, planets will from time to time pass in front of their star, absorbing some of the ...
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Why do we have eclipses if the Earth's orbit around the Sun and the Moon's orbit around the Earth aren't in the same plane?

We know that eclipse is when the Sun, the Earth and the Moon align in a straight line. How do they do this align if their orbit planes aren't in the same angle?
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What is a simple argument to prove that the stars in the sky are further away from the Earth than the Moon?

How do we know, without using modern equipment, that the stars are further away than the moon in the night sky? Further, is there a simple and actionable argument to prove that this is indeed the case?...
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1answer
60 views

Measuring the solar system's speed through ether with the help of an eclipse

In A.P. French's Special Relativity, the author said, Jupiter has a period of $12$ terrestrial years, and so in half a terrestrial year, while the earth moves from $A$ to $B$ (Fig. $2$-$7$), ...
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1answer
77 views

What are the objects that are like a crescent and blue sphere? (while taking shots of a solar eclipse)

This is the picture I have took while the solar eclipse. What are the objects that are like a crescent and blue sphere? I know that such (rays) appear whenever we photograph the Sun but what is the ...
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2answers
261 views

Why does the shadow of Io on Jupiter look so big?

It has been reported this week[0] that the following image by Kevin Gill is the shadow of Io crossing Jupiter. Why is the shadow so large? My intuition is that Io is much smaller than Jupiter so ...
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1answer
56 views

Gravitional bending of light in an eclipse of the sun, formation of an Einstein ring

Has it been observed that at Moon occultation of the Sun the bending of the light beam arriving from a distant stelar object behind the Sun is isotropic or the rotation of the Sun slightly modifies ...
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1answer
43 views

Ever looming shadow

If I'm not mistaken the reason the moon eclipses the sun is because the ratio of distance to size, in regards to the moon and sun, is 1:1. And is it not also true that the reason we only ever see one ...
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3answers
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Can we determine the date just from sky observations?

Assuming everyone "freezes" for several thousand years. Then everyone unfreezes at the same time. Could we tell how much time passed based on sky observations without fancy telescopes? (Just started ...
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209 views

Confusion about a claim in the “Brief History of Time” by Hawking

In the first chapter, while talking about how Aristotle was able to conclude that the Earth is spherical, Hawking says that had the Earth been a flat disk the shadow of the on the Earth on the moon ...
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1answer
49 views

What does the image from Eddington on gravitational light bending really show?

There is a famous image that one often sees taken by Eddington during the 1919 solar eclipse illustrating gravitational light bending as predicted by Einstein. Can someone explain what exactly is ...
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1answer
87 views

Why does the red light from Sun bend towards the moon during the total lunar eclipse?

During the total lunar eclipse the earth, moon and the sun are in perfect alignment so that the moon is within the umbral shadow of the earth. However, instead of turning invisible the moon actually ...
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1answer
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Lunar eclipse redness not visible through telescope?

I watched the total lunar eclipse on January 20-21 in North America. Looking at it with my eyeballs it appeared red. This is due to Rayleigh Scattering. When I looked at the eclipse through binoculars ...
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3answers
135 views

Shift of the apparent position of stars during the total solar eclipse

One of the evidence supporting the General Relativity is a shift of the apparent position of the stars during the total solar eclipse. I would like to know if the shift can be explained by other ...
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1answer
302 views

What is the diameter size of the umbra shadow cone of the Earth when the Moon passes through it on a lunar eclipse?

I am sure this varies given the distance from moon to earth varies, but a range would be sufficient. I am trying to explain to a flat earther how there is not a lunar eclipse every full moon. My ...
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Why does the moon becomes red instead blue during an lunar eclipse?

While observing an lunar eclipse, I noticed that the moon is first covered by a distinct strip of blue light, to then at its apogee, the moon is completed covered by a red light. I understand that the ...
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1answer
228 views

What does cause the 360 degree “sunset” during a total eclipse?

On August 21, 2017, I had the pleasure of witnessing a total solar eclipse. One of the main attractions was the 360 degree "sunset". But I am now wondering what does cause this phenomenon to happen ...
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Viewing totality though an unfiltered telescope [closed]

DISCLAIMER: This question is for informational purposes only and the ensuing discussion must not be construed as safety advice. There seems to be a consensus among experts that partial eclipse should ...
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1answer
314 views

why do total solar eclipses vary in length?

Quoting https://www.mnn.com/earth-matters/space/blogs/why-2024-total-solar-eclipse-may-outshine-2017, For the 2017 eclipse, the duration of totality will last between 20 seconds (over Kansas City,...
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Are there different defintions/ interpretations of the phrase “total solar eclipse”? [closed]

One total solar eclipse was visible in the United States on 08 June 1918. Another on 26 February 1979. Again, there was one just the other day (for those that might not have noticed). Links are ...
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1answer
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Is looking at an eclipse worse than looking at the sun? [duplicate]

I understand why looking at the sun is bad. I also understand that looking at the eclipse is bad. Is it more dangerous to glance at an eclipse than the sun, assuming you avert your eyes right very ...
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1answer
51 views

What speed should I maintain on land or in the air in order to experience the whole path of total solar eclipse?

What speed should I maintain on land or in the air in order to experience the total path of total solar eclipse? And What other factors are taken into account for calculating that speed? For e.g. ...
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1answer
670 views

How does the Sun burn a crescent shaped scar in your eyes during a solar eclipse?

I was listening to NPR this morning and a man talking about the solar eclipse said that you cannot look at even a sliver of the sun because it could still damage your eyes. He noted he's even had ...
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Why aren't 100% UV blocked sunglasses safe to view an eclipse with?

I am not planning on staring into the sun during an eclipse or any other time. I have been reading about how no variety of regular sunglasses are safe enough to view the eclipse with. I'm not talking ...
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1answer
119 views

Total eclipses becoming rare soon?

Given that the moon is receding from the earth and that the average angular size of the moon is approximately equal to the angular size of the sun at the moment, what is the current rate at which ...
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1answer
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Why can I look at the sun with my sunglasses but not at the solar eclipse?

Is the problem with seeing an eclipse that you have a sudden change between penumbra and regular sun? If that's the case, why can I look to the sun with my sunglasses on but I can't do it in an ...
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2answers
3k views

Can two polarized glass filters held at near 90° orientation serve as safe eclipse glasses? [closed]

Using two polarized filters to block all (?) light is a common classroom demonstration. With the imminent north American total eclipse, the media has been pushing eclipse glasses and emphasizing the ...
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3answers
268 views

Solar Eclipse Path of Totality

Every depiction I have seen shows the Eclipse path of totality travel Eastward from Oregon. Why Doesn't the path travel Westward from South Carolina as the Earth rotates Eastward? Shouldn't the ...
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What are eclipse glasses made of? [closed]

What is the principle of eclipse glasses? Are they just high optical density plastic, or do they do something fancier? Could I make my own by taping ND filters into cardboard? I tried Googling ...
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2answers
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Why isn't there an eclipse every month? [duplicate]

Given that eclipses occur, why aren't they more regular? If the sun and the moon are in the same plane, shouldn't the moon transect the line from the earth to the sun every month? I guess order of ...
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What are ShadowBands during SolarEclipse and how can it be reproduced?

I recently got to know about different phases of a solar eclipse and its impact on Earth and its living creatures.., but one of the most interesting and not well explained phenomenon is the ...
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1answer
838 views

Traveling in the umbra of a solar eclipse

On August 21 this year, parts of the United States will experience a total solar eclipse, as many of you probably know. Say that I am in an airplane at the center of the umbra of the moon when it ...
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1answer
43 views

Time Desynchronization (gravitational)? What if an eclipse was synchro between 2 altitudes on earth 1 million years before and is still synchro today?

2 events watched from 2 altitudes. Imagine an eclipse of the sun happens 1 milion years before (event 1) and it happens once more (event 2). (2 eclipses with 1 milion year interval watched from 2 ...
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1answer
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2017 solar eclipse: why are these two maximal eclipse points different?

referring to this guide, there is a point in southern Illinois that has the longest duration eclipse and a point in western Kentucky where the eclipse is the "greatest". the first i understand, the ...
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4answers
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Why does the sun have to be nearly fully covered to notice any darkening in an eclipse?

I was looking at eclipse footage and I noticed that it doesn't get any noticeably darker until the very end when it suddenly all the light is gone. As the moon blocks out the Sun, I would expect that ...
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0answers
219 views

Can we calculate the point on Earth nearest to the Moon?

We have the ability to calculate the Moon's orbit in order to predict Lunar and Solar eclipses precisely. Using our known calculations of the Moon's orbits, can we calculate the closest point (city ...
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1answer
224 views

Does solar eclipse have impact over increase of earth's temperature?

Does a solar eclipse have an impact on global temperature? Wired theory : When I jump, does the Earth recoil? Yes, the Earth has to move in some way for momentum to be conserved. However, since ...
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1answer
109 views

How could a solar eclipse cause my light bulb to explode? [closed]

Any explanation to this? as it happened right during the phase of eclipse or is it just coincident? I had just finished my breakfast and on the way to go outside to watch the eclipse and before it ...
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2answers
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Why are Lunar Eclipse more common than Solar Eclipse?

Why are Lunar Eclipse more common than Solar Eclipse? Chapter from Light My thoughts; Eclipse can only occur at new moon and moon orbit is inclined at an angle of about 5 degrees to the earth's ...
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1answer
109 views

Can you see a solar eclipse from the International Space Station?

Inspired by last week's solar eclipse, I'm wondering under what conditions one can see a total solar eclipse from the ISS. How often does it happen? I guess it doesn't last very long because of the ...
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1answer
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Eclipse of the sun - Intriguing luminosity curve

I've just recorded the luminosity during the sun eclipse, here is the resulting curve : Only green curve is relevant, blue curve should be ignored (it's actually the temperature). The sky was ...
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2answers
175 views

Why is solar eclipse so important for sunlight spectrum analysis?

People wait for decades to catch the chance of a solar eclipse to observe the sun. Why cannot they do it every noon?
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1answer
274 views

Why is a flower shaped diffraction occluder the best solution for controlling diffraction?

According to this TED talk by Jeremy Kasdin, Nasa is planning to spend $1bn on a "Starshade" project, where a giant flower shaped metal eclipser 20 meters wide is placed 50k kilometers in front of a ...
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2answers
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Is a total solar eclipse a common phenomenon?

Is our moon "special" for creating a total solar eclipse? Is it common or rather rare for a moon to create a total solar eclipse the way our moon does, with corona and such?
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Strange things about new moon [duplicate]

I have some strange and infantile questions about new moon. I want to know how is it possible that the Moon is not visible at night and also at day it is not Sun eclipse? I will explain the problem in ...
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1answer
775 views

The Moon is slowly moving away from the earth. Does this mean that a total solar eclipse wasn't possible at some point in earth's history?

When the moon was closer to earth, was it still possible to witness a total solar eclipse millions of years ago? Or was the view-able space so small that it was impractical to even witness it?
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Why are solar eclipses more common in the southern hemisphere?

I've seen the claim that solar eclipses are more common in the southern hemisphere than the northern hemisphere and would like to understand why and if that is the case? Does it relate more to the ...