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The Darkening of the Sky During a Total Solar Eclipse

During a solar eclipse, the sky maintains a high brightness even when the Sun is, say, 95% eclipsed by the Moon. During the last ten seconds before totality is when most of the darkening of the sky ...
michaelc35's user avatar
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0 answers
41 views

The astonomer's method of color differencing as applied to proving Einsteinian relativity during a total solar eclipse

I'm looking to see if the astonomers' method of color differencing was ever applied to the stars near the Sun during a total solar eclipse, for example, to demonstrate Einsteinian relativity visually ...
user1621287's user avatar
3 votes
0 answers
60 views

What causes the plane contrails to bend in the foreground of the eclipse?

This looks almost like refractive index of air is different in the shadowed part, but what would cause that?
Dargscisyhp's user avatar
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0 votes
2 answers
88 views

Light from an eclipse [closed]

Why do people fry their eyes staring at the sun during a solar eclipse? Is it that they stare at the sun for a long time---longer than if they stared without an eclipse? Or is it that during the ...
Thad_The_Man's user avatar
13 votes
7 answers
4k views

How different is a 99.5% eclipse from a total eclipse?

There is a total solar eclipse happening in North America in early April. People will be travelling long distances to see it, and towns near where I live are warning residents to buy gasoline in ...
Kate Gregory's user avatar
3 votes
2 answers
541 views

Is it possible, by monitoring the brightness of stars, to find a “copy of the Earth + Moon” near them?

More than a dozen Earth-like planets have been discovered around nearby stars based on observations of changes in the brightness of their sun as they pass across its disk (transit events). If an Earth-...
Ванек Огонек's user avatar
0 votes
0 answers
46 views

Why does a total solar eclipse happen every 18 Months?

What is the math involved in calculating how often a total solar eclipse happens. Can you predict it by just looking at the period of the moon around the earth and the period of the earth around the ...
244529's user avatar
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0 votes
0 answers
72 views

What math predicted the eclipse of Betelgeuse?

It's amazing that scientists can predict something as small as last weeks eclipse of Betelgeuse. The general relativity aspects are quite specialized. Can someone point me to the math involved in ...
foolishmuse's user avatar
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75 views

Do the line of Apsides and Line of Nodes of the Lunar orbit ever coincide (or change their relative position and does this explain Annular eclipses?

In the context of solar eclipses, my understanding is that an annular eclipse occurs when specific conditions are met, involving the relative positions of the Earth, the Moon, and the Sun. To be more ...
Sanjay Biswas's user avatar
1 vote
1 answer
137 views

What is the physics behind the cooling of the atmosphere during a total solar eclipse?

Consider the Great American Eclipse (The total solar eclipse over America in 2017). Observed atmospheric temperature drops were in the range of 3 C to 8 C in a matter of minutes. Surface ...
PaulSnow's user avatar
0 votes
1 answer
102 views

Could humanity buy more time with climate change by blocking out some direct rays of the Sun with an artificial (partial) eclipse?

Imagine the Earth faced the imminent crisis from climate change as the planet warmed by 1.5C. As a last ditch attempt to buy more time, humanity finally decided to do whatever it takes to stop the ...
Rich K's user avatar
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1 answer
128 views

Temperature estimate from eclipsing binary

So assuming perfect edge on eclipsing binary, we can estimate the temperature ratio of the two stars because the "blocked area" is the same, and thus the amount of light "dimmed" ...
ABC's user avatar
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0 answers
54 views

Speed of light estimate from Io's eclipses by Ole Rømer

It can be found elsewhere that Ole Rømer estimated the speed of light (in terms of UA/h, probably) by accounting cumulative delay in Io's eclipses. My question here is: how did he measure time with ...
Brasil's user avatar
  • 172
0 votes
1 answer
69 views

What's the time window for total and narrow eclipses?

Because of the tidal effect angular momentum is transmitted from Earth rotation to the Moons orbit around Earth. This means that perfect eclipses only has occured during a certain time window. Can ...
Lehs's user avatar
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20 votes
3 answers
2k views

Why is it so dark during a solar eclipse?

At a total solar eclipse the sun is barely covered, like right after sunset. So why is it much darker than right after sunset (which allows us to see the corona)?
George Lee's user avatar
7 votes
2 answers
1k views

The effect of gravitational lensing during the lunar eclipse

During the lunar eclipse, the Moon turns into bloody colour while the shadow of the Earth is casting over the lunar surface. The red hue can be explained by means of the refraction of light and ...
Kevin Kwok's user avatar
10 votes
3 answers
2k views

Proof/explanation that Sun is bigger and more distant from Earth than Moon is, Middle Age technology allowed only

If I was living in the Middle Ages, how can someone prove or at least explain to me in a simple way that the Sun is bigger and more far from Earth than the Moon? Can a parallax be used for it? $$\text{...
Jane N.'s user avatar
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2 votes
1 answer
90 views

Is a 3 body system with a permanent eclipse possible and stable?

Is it possible to have a star, planet and moon where the moon orbits the planet in the opposite direction with the same period of the planet orbiting the star? So that there would be a never-ending ...
user avatar
2 votes
1 answer
85 views

Why Earth is viewed crescent from moon when the Earth is experiencing total solar eclipse?

Suppose a person, let's say Neil, is on moon and Earth is experiencing a total solar eclipse so how should Neil perceive the Earth? This is also a question from KVPY (5/11/2017) question no. 22. as ...
Gamin8ing's user avatar
2 votes
1 answer
46 views

Harmful Radiation When a Thinly-Veiled but Evident Sun is Directly Viewed Under Haze or Cloud Cover

When it is hazy or overcast with many thin fast-moving clouds, the sun sometimes appears faintly though the cover---making it possible to be observed without any discomfort. In fact, one could easily ...
DDS's user avatar
  • 231
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1 answer
294 views

Fraunhofer lines during an eclipse

I know that Fraunhofer lines are certain wavelengths in the Sun's spectrum that are 'missing' because of absorption at the chromosphere. In other words, they are 'dark'. But my book clearly states ...
Ambica Govind's user avatar
-1 votes
2 answers
182 views

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 ...
seamos's user avatar
  • 81
0 votes
1 answer
72 views

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 ...
XXb8's user avatar
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1 vote
1 answer
121 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 ...
Vikash Kumar's user avatar
2 votes
1 answer
123 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 ...
Electra's user avatar
  • 293
1 vote
2 answers
319 views

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?
Snack Exchange's user avatar
19 votes
7 answers
8k views

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?...
kbakshi314's user avatar
  • 2,402
2 votes
2 answers
119 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. $2$-$7$), ...
Hilbert's user avatar
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1 vote
1 answer
1k 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 ...
Mani Ananth's user avatar
4 votes
4 answers
744 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 ...
jl6's user avatar
  • 231
0 votes
1 answer
106 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 ...
Janko Bradvica's user avatar
0 votes
1 answer
57 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 ...
user235207's user avatar
5 votes
3 answers
233 views

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 ...
Goodwine's user avatar
  • 195
0 votes
2 answers
488 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 ...
Sal_99's user avatar
  • 423
1 vote
1 answer
83 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 ...
user1887919's user avatar
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2 votes
1 answer
1k 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 ...
Solidification's user avatar
1 vote
1 answer
59 views

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 ...
colorlace's user avatar
  • 111
3 votes
3 answers
373 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 ...
koryakinp's user avatar
  • 163
1 vote
1 answer
2k 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 ...
Curiousity Cat's user avatar
1 vote
0 answers
136 views

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 ...
Ernesto Melo's user avatar
1 vote
1 answer
1k 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 ...
Ernesto Melo's user avatar
3 votes
0 answers
139 views

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 ...
Abhishek Anand's user avatar
0 votes
1 answer
904 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,...
neubert's user avatar
  • 167
-1 votes
1 answer
68 views

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 ...
cobaltduck's user avatar
2 votes
1 answer
4k views

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 ...
USER_8675309's user avatar
0 votes
1 answer
71 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. ...
Haris Ghauri's user avatar
1 vote
1 answer
954 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 ...
DasBeasto's user avatar
  • 141
52 votes
3 answers
40k views

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 ...
Jeff's user avatar
  • 493
5 votes
1 answer
170 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 ...
mmainville's user avatar
-2 votes
1 answer
2k views

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 ...
Moltimor 's user avatar