Questions tagged [the-sun]
Questions regarding the closest star to Earth, at the centre of the Solar System.
565
questions
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1answer
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Why we can't see our Sun as it was a few years ago?
Our Sun is orbiting the center of the Milky Way galaxy. So many years ago, it was at a different location from where it is now.
In addition, we are observing stars and exoplanets as they were many ...
2
votes
1answer
58 views
What is the exact time of sun stay in each zodiac every year on sidereal year duration?
I tried to reverse engineer from astro-chart times at which sun stays in a zodiac.
Here is the list.
...
0
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0answers
24 views
The sun networks [duplicate]
For my research about the sun activity I need to edit pictures of the sun. I want the pictures to show three stages the quiet, enhanced and active/plage network. I couldn't find any information in the ...
1
vote
1answer
29 views
Difference between quiet, enhanced and active networks
For my research about the sun activity I need to process pictures of the sun. I want the pictures to show 3 stages the quiet, enhanced and active network. I couldn't find any information in the ...
6
votes
1answer
75 views
Is there a verification of the solar system barycenter as it is theoretically determined?
The barycenter of our solar system is not the sun, but a changeable location outside of the center point of the sun. A often used diagram of that relation is shown below, originated from the Wikipedia ...
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0answers
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X-rays, Solar wind and Sun's corona
I was reading that Solar corona emits the solar wind however also X-rays. What is the difference during the creation of these effects and impacts on our atmosphere?
Thank you!
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0answers
25 views
Calculating angle between the sun and a perpendicular to earth given lon/lat & time
If you had your longitude/latitude, and the time/date, how could I go about working out the angle between your normal and the sun?
At first I was doing a simplistic approach of assuming elliptical ...
0
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2answers
53 views
How can I calculate 27 tropical/solar year since my birthdate?
Let's say I was born on 27th November 1993 at 03:15:15 AM. Is there any way I can calculate exact 27 tropical cycle since my birthdate/birthtime.
What date and what time it will be after exact 27 ...
0
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0answers
36 views
Astronomical events and Celebrations
In the past people celebrated important astronomical events and some of those events are still celebrated in some cultures and traditions.
For example: March/September equinox, New Moon, Winter/...
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29 views
Stellar interior structures
im really confused on how i relate mass to radius of a star with a non constant density. more specifically i cannot seem to find an equation that states how density varies throughout a main sequence ...
2
votes
1answer
39 views
Does Earth's magnetic field become stronger when a solar flare hits?
This curiosity arises as follows: when ejecta from a strong solar flare hits Earth, will the Earth somehow counter its impact with a stronger magnetic field.
Or, earth's magnetic field as limited ...
3
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0answers
36 views
Why do CME's “zig-zag” on their way to Earth?
This answer states:
A single CME will impact a spacecraft from only one direction, but that direction might not be directly from the sun because a CME may zigzag en route.
Looking at that link, ...
2
votes
1answer
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Latitude of given altitude of Sun
From Question #6 of USAAAO First Round 2018
(1 point) For the following problem find the range in which the answer lies: on the day of summer solstice, on which geographic latitude is the sun ...
2
votes
1answer
142 views
Why do the magnetic field lines of the earth go from south pole to north pole?
I saw these figures and could not get why the magnetic field lines are not pointing from the north pole towards the south pole but they do the opposite.
Or also this picture which is about magnetic ...
1
vote
1answer
64 views
Sun and moon's orbit in ecliptic coordinates using skyfield
I am new to using skyfield, is there any doc or help file that can show me on how to get the orbit of Sun and moon in ecliptic coordinate for a particular date and ...
0
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0answers
78 views
how is it possible to see the sun and the moon at the same time? [duplicate]
I once saw the sun and the moon at the same time once. How is this possible?
Im from london england U.K and this probably some time in 2017 autumn time at around 6pm any Ideas.
2
votes
2answers
125 views
Is the sun flipped on the other side of the world?
As the orientation of the moon is different in the northern and the southern hemisphere, is the orientation of the sun different in both hemisphere?
Does a sunspot appearing in the Sun northern ...
1
vote
2answers
66 views
Can I use the Tokyo Skytree as clock?
After my observation today at the Skytree in Tokyo, I am wondering if this building could be used as a giant sundial?
As an aside, it would be interesting to consider how the Skytree might be used ...
44
votes
2answers
4k views
Does the sun cross other spiral arms in its movement around the galaxy's center?
Today, Ansa.it released an article that states:
[...]. In questo suo peregrinare galattico, il Sole ha attraversato anche
i due bracci della Via Lattea Perseo e Centauro. "Sono zone di alta
...
2
votes
1answer
53 views
How much does the stellar radius change if seen through different filters?
I know that the radius of a star should be different depending on the filter being used to do the observation. That is, the bluer the filter, the smaller the measured stellar radius. I know this ...
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votes
1answer
91 views
Solar degrees vs Calendar days [closed]
What is the difference between solar degrees and Calendar days. Is there any formula to convert one to another.
for example Starting from 1/1/2000
1/1/2000 + 300 calendar days=some date (easy)
1/...
5
votes
2answers
357 views
Why does the Solar Wind consist of charged particles?
The Wikipedia article on Solar Wind gives the following explanation:
The solar wind is a stream of charged particles released from the upper atmosphere of the Sun, called the corona. This plasma ...
4
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0answers
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Simulate earth, moon, sun constellation with dates
I would like to simulate the three object distance, specifically the distance of the moon to both, sun and earth for further investigation into tide prediction.
What would be a good starting point ...
6
votes
1answer
158 views
A vertical stick's shadow at solar noon should be straight north/south, right?
At true solar noon, the subsolar point should be directly north or south of you, and therefore a vertical stick's shadow should point directly north or south, right?
The Wikipedia page for Sun Path ...
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vote
1answer
136 views
What would we notice if the Sun stopped fusing atoms? [duplicate]
(This question was stimulated by Would we have more than 8 minutes of light, if the sun "went out"?)
According to this answer, the "Sun has enough gravitational potential energy to supply ...
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2answers
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Would we have more than 8 minutes of light, if the sun “went out”?
The common theory is, that if the Sun "shut down", we would see the light for eight more minutes (the time that it takes the photons to reach the Earth).
However recently I have read that photons ...
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0answers
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IAO 2015 Question 1 Noon at the Olympiad
Yesterday, on October 16, 2015, the upper culmination of the Sun at the venue of the Olympiad was at 11:29:44 local time. Calculate as accurate as possible at what time the upper culmination of the ...
19
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4answers
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Would an object shot from earth fall into the sun?
Would an object shot from earth fall into the sun?
If an object is shot at 107,000 km/h via rocket or otherwise, in the opposite direction to our orbit about the sun, it will be traveling at 0 km/h ...
5
votes
1answer
350 views
Is the resulting light from a supernova a product of photons bouncing around in the Sun?
I was thinking about how photons formed in the centre of the Sun take quite a long time to exit the surface. And it occurred to me that at the end of a star's life (during a supernova, given that it's ...
3
votes
0answers
61 views
Does the Sun have a numerical designation in any star catalogues?
Given the existence of large star catalogues listing millions of astronomical objects with numerical designations (such as Tabby's Star, KIC 8462852) it occurred to me that one of them might contain ...
5
votes
1answer
62 views
What is the intensity distribution of visible light over the solar disk?
What is the distribution of the visible spectrum over the solar disk?
Images of the Sun using the visible spectrum suggest that the light emmitted from the edge is almost equal to the light emmited ...
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0answers
29 views
Angle of the Sun during winter solstice
What is the angle of the Sun on the eastern horizon at 35° latitude if it is the winter solstice?
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2answers
60 views
What parameters cause sunburn? [closed]
I am new to this site so if the question doesn't fit in this forum feel free to remove it.
I have read here https://en.wikipedia.org/wiki/Sunburn of all the causes of sunburn and I was mostly aware ...
3
votes
1answer
108 views
Any simple experiment with an H-alpha telescope?
Is there any simple experiment that can be done with an H-alpha telescope, for example to estimate the Sun's mass, size, distance, temperature or intensity?
I give lessons about renewable energy and ...
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vote
0answers
51 views
Is there any possibility that a gas planet turns into a star [duplicate]
Since the sun is made of one of elements hydrogen
Why Saturn and jupiter doesnt turn into a star since they have a elements of hydrogen ?
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vote
0answers
112 views
How big a rock can hit the sun and it not matter? [duplicate]
If a rock the size of Oumuamua were to crash into the sun — assume central collision — would it materially affect the sun’s behaviour? Would unaided humans (rather than sun-tastic special telescopes) ...
1
vote
2answers
105 views
Does the magnetic field of earth restore?
The magnetic field of earth protects us from solar wind as we know it, but after the solar wind interacts our magnetic field.
Does the magnetic field of earth restore after it deflects the solar ...
1
vote
1answer
41 views
Maxwell stress contribution to $\nabla \cdot \mathbf{P}$ in the Navier-Stokes equation for fluid in stars
I was reading through the following extract outlining how the Maxwell stress contributes to the $\nabla \cdot \mathbf{P}$ term of the Navier-Stokes equation for fluids in a star. Here $\mathbf{P}$ is ...
0
votes
1answer
125 views
Why is the Sun's Luminosity not equal to the Zero Point Luminosity?
I was doing some research and found that the zero-point luminosity was $L_\odot = 3.75\times 10^{28} $, while the sun's reported luminosity was $L_{Sun} = 3.828\times 10^{26}$, according to Wikipedia. ...
3
votes
1answer
175 views
Why is our Sun hotter than UY Scuti?
As Wikipedia says the surface temperature of UY Scuti is 3,365 K and the sun is 5,778 K
Why is the Sun hotter than a supergiant star like UY Scuti?
3
votes
2answers
207 views
Can an Earth-like planet survive if our Sun went Supernova?
First, I would like to point out, yes, our sun does not have enough mass to be a candidate for Supernova, this is a scenario were our sun is though, and after the various life cycle stages of the sun ...
3
votes
1answer
138 views
At what depth below the Sun's surface does the density reach that of water?
I'd like to write a short supplementary answer to A probe floating in Sun's surface but in order to do so I need to know at roughly what depth relative to the Sun's surface the mass density reaches 1 ...
0
votes
2answers
104 views
What is the density profile within the Sun's photosphere? Which one of these is wrong?
The Sun's photosphere contains the Sun's surface as defined by opacity = 2/3 point. I'd like to see the profile of mass density from bottom to top of the photosphere. I did a quick search and got ...
1
vote
1answer
68 views
Earth's perihelion vs winter solstice [duplicate]
I found that Earth's perihelion occurs roughly two weeks after winter solstice similar thing happens for summer solstice and aphelion. I understand what those terms mean but I don't understand the ...
3
votes
2answers
357 views
What would happen if a Sun-like star were to consume a Jupiter-like planet?
A substantial number of discovered exoplanet systems are likely contain more than one gas giant with distances far closer to the star than in our solar system.
It is known that in solar system ...
1
vote
2answers
71 views
What are some examples of routine human activity times for certain cultures/peopes that are based on the position of the sun?
What are some examples of timekeeping that are based on the height/angle/position of the sun. Two examples that come to mind are the times of the Islamic prayers times and the golden hour in ...
2
votes
1answer
51 views
How could the polarizer in early coronagraphs make the Sun's corona more visible against the daytime sky?
Wikipedia's Coronagraph; Invention says:
High Altitude Observatory's Mark IV Coronagraph on top of Mauna Loa, uses polarization to distinguish sky brightness from the image of the corona: both ...
2
votes
1answer
35 views
Where can I find a good solar irradiance chart for the infrared?
I'm trying to understand the results of the ExoMars Trace Gas Orbiter vs the Mars Express in terms of their abilities to find methane on the surface of Mars. The solution that I'm coming to is that it ...
1
vote
1answer
126 views
What keeps the planets of the solar system moving in their fixed orbits?
Models of the solar system show each planet moving around on its own orbit.
Is is really because of the Sun that every planets remains in its own fixed orbit?
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1answer
92 views
The sun's SOLAR WIND VS MAGNETAR
As we know magnetars have strong magnetic field but what if we swap earth with a magnetar and the sun will released a solar wind. Is the magnetar affected by the solar wind or not ?
