Questions tagged [eclipse]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
1answer
40 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 ...
6
votes
3answers
134 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 ...
1
vote
2answers
186 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 ...
1
vote
1answer
45 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 ...
2
votes
1answer
44 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 ...
1
vote
1answer
28 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 ...
0
votes
0answers
16 views

Do lunar eclipses cause similar (but less pronounced) optical effects as solar eclipses?

There are a number of impressive optical phenomena that occur on the ground during a total solar eclipse: In a partial solar eclipse, when part of the disc of the sun is occluded, shadows on the ...
3
votes
3answers
106 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 ...
1
vote
1answer
139 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 ...
1
vote
0answers
74 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 ...
1
vote
1answer
133 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 ...
3
votes
0answers
118 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 ...
0
votes
1answer
239 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,...
-1
votes
1answer
62 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 ...
1
vote
1answer
2k 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 ...
0
votes
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. ...
1
vote
1answer
641 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 ...
45
votes
3answers
24k 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 ...
3
votes
1answer
111 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 ...
-1
votes
1answer
1k 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 ...
2
votes
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 ...
2
votes
3answers
249 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 ...
1
vote
0answers
290 views

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 ...
1
vote
2answers
1k views

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 ...
1
vote
0answers
19 views

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 ...
3
votes
1answer
799 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 ...
0
votes
1answer
42 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 ...
1
vote
1answer
161 views

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 ...
61
votes
4answers
6k views

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 ...
0
votes
0answers
215 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 ...
1
vote
1answer
209 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 ...
-1
votes
1answer
102 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 ...
2
votes
2answers
1k views

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 ...
0
votes
1answer
108 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 ...
11
votes
1answer
200 views

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 ...
2
votes
1answer
259 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 ...
7
votes
2answers
997 views

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?
11
votes
0answers
326 views

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 ...
3
votes
1answer
754 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?
5
votes
1answer
1k views

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 ...
10
votes
2answers
2k views

Why don't we see solar and lunar eclipses often?

Since we see the new moon at least once in a month when the Moon gets in between of the Sun and the Earth during the evening ( and as far as I know if this happens during the day, you'll get to see a ...
2
votes
1answer
11k views

Why don't we see solar and lunar eclipses often? [duplicate]

Since we see the new moon at least once in a month when the Moon gets in between of the Sun and the Moon at the night and as far as I know if this happens during the day, you'll get to see a solar ...
9
votes
2answers
5k views

How can the date of lunar eclipses be calculated by hand?

How can the date of lunar eclipses be calculated? Especially without the aid of a computer.
7
votes
1answer
45 views

Is There Reddening on Objects Other than the Moon Upon Entry into Earth's Umbra?

With the recent lunar eclipse, for some reason this question came to me: The reason the Moon turns red is that the only appreciable sunlight hitting it when it's in Earth's umbra is refracted through ...
6
votes
1answer
144 views

Best observing techniques for a Total Lunar Eclipse?

Is there any good tricks to observing a total lunar eclipse that I should be aware of? Just wanting to know what to do to be prepared for the upcoming one, but please post in general for future ...
4
votes
3answers
76 views

November 25th 2011 partial solar eclipse visibility from Christchurch, New Zealand

Where can I find a site that will give me an indication of coverage for the November 25th 2011 partial solar eclipse as viewed from Christchurch, New Zealand tonight, as well as local times for the ...
3
votes
3answers
442 views

What was the apparent magnitude of the June 15th 2011 lunar eclipse?

My plan was to observe and estimate the apparent magnitude of the Moon during totality of the June 2011 lunar eclipse, but the clouds rolled in at the exact moment, so I couldn't make any useful ...
11
votes
1answer
135 views

Why did the june 2011 lunar eclipse last so long?

It was kind of hard to miss the lunar eclipse this week, although I didn't see it in person (Sod's law means that on every relatively major astronomical event clouds cover where I am). From what I ...
40
votes
4answers
21k views

Why is a new moon not the same as a solar eclipse?

Forgive the elementary nature of this question: Because a new moon occurs when the moon is positioned between the earth and sun, doesn't this also mean that somewhere on the Earth, a solar eclipse (...
5
votes
2answers
20k views

Are dangerous rays emitted during Solar Eclipse?

It is said one should avoid staring at Sun as it can damage the eyes, but it is also said that one should not come out in sun during eclipse as it emits dangerous rays. Is that true? If yes, why?