Questions tagged [the-sun]
Questions regarding the closest star to Earth, at the centre of the Solar System.
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3answers
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In which direction is the sun travelling?
Relative to this simple drawing, can someone explain to me,
in which direction is the sun and its solar system travelling,
which star (irrespective of distance) is closest to that direction,
and in ...
1
vote
1answer
36 views
How to get the solar zenith from the longitude and latitude?
I have real data of “Direct Normal Irradiation” and “Diffuse Horizontal Irradiation” and I should calculate “Global Horizontal Irradiation”. I have also longitude, latitude and elevation.
Could you ...
5
votes
2answers
99 views
How does the Sun orbit the Sun-Jupiter Barycenter?
I got the Orbital Elements of Jupiter around the Sun, which describe how it orbits relative to the "fix" Sun.
Jupiter
Semi Major Axis (AU): 5.20336301
Eccentricity: 0.04839266
Inclination to ...
3
votes
2answers
65 views
A few questions regarding the transit of planets
Here we will be concerning ourselves with the transit of a planet with it's parent sun.
I have a few questions that I am not sure about:
1) Do all planets transit their parent sun? It would seem to ...
6
votes
1answer
61 views
Mars vs Venus: the retention of atmospheres in relationship to Earth
Correct me if I'm wrong, but the factors than enable a planet to retain or lose an atmosphere seem to be: 1. Magnetic Field, 2. Solar Winds, 3.Weight of Gases, 4. Planetary Temperatures. 5. Distance ...
6
votes
1answer
66 views
22° Sun halo today in Zimbabwe. But there's a moon like thing inside the halo beneath the sun that cannot be seen with the naked eye, what is that? [closed]
Guys what is that moon like thing inside the halo?
3
votes
3answers
61 views
Why does earth's north pole roughly point in the same direction throughout the year?
I know there is a gioscopic explanation but I was under the impression that Earth is traveling in a straight line through space that has been curved by our sun's gravity ,so my question is why doesn't ...
4
votes
1answer
65 views
When are the planets occulted by the sun?
There are numerous lists available of past and future planetary transits and occultations, but I can't find any that list transits behind the sun.
Do the planets in our solar system ever pass ...
6
votes
2answers
68 views
How far can you see in solar plasma at just under 1 solar radius?
I was trying to compose an answer to this question here, about touching the surface of a star, and I was going to mention that the popular depiction of the sun's surface as 'basically lava' (as ...
3
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0answers
31 views
How does the geometry for constructing a declining vertical sundial work?
I understand how to construct South-facing vertical an horizontal sundials and the geometry behind their construction by projecting an equatorial sundial into a plane, but I can't quite get how to do ...
4
votes
3answers
935 views
Sun's Stellar Class at Birth?
The Sun currently has a stellar class of G2V. However, since its birth, the Sun has brightened significantly. What would the Sun's class have been when it was born ~4.6 gyr ago?
0
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1answer
53 views
Sunrise - from earth - sun position or when sun rays reaches earth?
Time for the sun rays to reach earth is approximately 8 mins.
If time of the sun rise is 7:30 - which time is this? Time when sun rays reaches earth or time when earth and sun comes into correct ...
8
votes
1answer
664 views
Can one detect from earth that angular momenta of its axial rotation and its orbital rotation are “almost parallel”?
I mean that the angle between these angular momenta is acute as opposed to obtuse (23.5 and not 180-23.5), so that the rotations are "roughly in the same direction".
Related but distinct question -- ...
0
votes
1answer
41 views
What is a “semester series” for eclipse prediction? - Solar saros series 147 and 152
Yet again, I just stumbled across another baffling eclipse question (actually, two now). I was interested in two eclipses (Saros series 147 and 152) that will both be occurring in 2021. Each of these ...
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votes
2answers
115 views
Remains of the progenitor of the Sun
It has been argued that it is not possible to trace back the remains of the progenitor star of the Sun (sometimes called Coatlicue), which, being estimated in the mass range of 30 $M_{\odot}$, should ...
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2answers
140 views
From what distance would our sun have an angular diameter of 7 arc seconds?
If an observer travels away from our sun, at what distance would our sun occupy 7 arc seconds of space?
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1answer
106 views
What is the orbital period of our sun around its barycenter?
In years, what is the time it takes our sun to orbit around our solar system's barycenter?
3
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1answer
64 views
What does it mean that the Sun`s rotation axis is: RA 286.13° , Dekl: 63.87°?
first post here.
I found 1 related Question, which has not solved my Problem.
SHORT QUESTIONs VERSION:
Suns axis is 7,25° tilted from the ecliptic. But in which direction?
LONG QUESTION:
Nasa ...
2
votes
1answer
82 views
What is the planet relative to earth that shows the greatest change in apparent brightness?
What is the planet relative to earth that shows the greatest change in apparent brightness?
I think the answer is Mars, and a quick google search reveals it is Mars.
I have my reasoning here, but I ...
2
votes
2answers
63 views
Calculate position of the Sun in ECEF
I'm making a very basic orbit simulator in C# using the Helix Toolkit.
I want to position the Helix lighting object at the sun, but also be able to calculate solar eclipse by the moon and earth for a ...
4
votes
0answers
61 views
“Pluto Time” for any solar system body
A while back NASA made a site called Pluto Time, where you can enter your address and find that "...moment near dawn and dusk each day, where the illumination on Earth matches that of high noon on ...
2
votes
1answer
68 views
How much more atmosphere is the sun passing through at sunset as opposed to at its peak in the sky?
I was looking at the sun during a sunset earlier today and wondered how much atmosphere you need to be able to look directly at the sun without damaging your eyes. The thought crossed my mind because ...
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3answers
63 views
Hypothetically, if our sun was yellow would we still see “white” colours?
Hypothetically,if our sun was yellow would we still be able to see white colour on objects like snow,cotton etc.? Would we have the phenomenon of rainbow?
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2answers
117 views
How do astronomers know when the Sun will die?
How it is possible for astronomers to find out when the end of the Sun's life will be?
1
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1answer
65 views
What phenomena was this video from SOHO actually showing?
My friend showed me a video of a CME that looked as if it was swirling into a gigantic circular "spaceship" or "UFO" and he explained it as "an alien ship potentially refueling". I did a bit of ...
3
votes
1answer
72 views
Why does the adiabatic exponent decrease at the ionization zones?
The context is the ionization zones in stellar atmospheres or interiors, the Sun, for instance.
The adiabatic exponent is the heat capacity ratio:
$$\gamma = \frac{c_P}{c_V} = \frac{C_P}{C_V}$$
And,...
3
votes
0answers
53 views
Erratic Sundial
My sundial shows real time until 11am when it will drop behind an hour until sunset. This is in keeping with daylight saving but why does it show real time before 11am? Am I missing something ...
1
vote
2answers
62 views
Movement of the Sun in space
Does the Sun undergo any cycles or revolutions approximately every 24,000 years or 8.6 million years? In Hinduism it is believed that the Sun revolves in an elliptical orbit around a large mass at ...
1
vote
0answers
31 views
What's the time in which the sun rises? [duplicate]
What's the time the sun takes in order to rise? (The time in which the solar disk crosses the horizon)
How does this time depend on local latitude and the sun's declination?
Assume that we're at sea ...
1
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0answers
48 views
How much magnetic attraction is there between the Sun and Earth?
How much magnetism is there between the Earth and Sun? Would the distance from the Sun differ for not the Earth iron core and how much?
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1answer
118 views
Why does the sky look like it has three suns in this video? [closed]
Check out @natalie9280’s Tweet:
long story short, friday morning at around 6:40am i looked outside and i saw three suns.
i checked to see if there was an eclipse and i could[n't] find anything.
...
2
votes
1answer
99 views
How would a flat mirror on the Moon reflect sunlight
I was solving a task that said (paraphrasing):
There is a flat mirror on the Moon, whose reflection coefficient is 100%, and observers on the Earth observe it as a star whose apparent magnitude is $...
1
vote
1answer
65 views
Why is the shadow of the earth not visible during sunsets?
I would imagine that during a sunset, for a brief moment of time, there would be a shadow of the earth seen in the clouds but I have never seen this. Why does it not happen?
25
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3answers
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Where did the Sun get hydrogen to work with if it is in the 3rd generation of stars?
As I see here, the Sun belongs to the Population I group of stars, which is the 3rd generation of the stars in our universe. 1st generation stars are Population III, 2nd generation are Population II, ...
1
vote
1answer
33 views
Recognising lunar month only by looking the sky
Suppose somebody went on an island and don't have sense about time, dates, months. The only thing he has is seeing the sky. Is it possible to recognise which lunar month it is by just looking the sky? ...
3
votes
3answers
1k views
How did the solar system get its angular momentum? Why did Earth not fall into the Sun at the start? [duplicate]
I know that Earth is always falling towards the Sun, but due to its sideways momentum it just misses always. But how did it all start? To go into detail, when the gas cloud with zero angular ...
5
votes
2answers
123 views
Why is sunset on 21st of June not the latest?
Why is the sunset not the latest on 21 June, but only on 27 June. Purely geometrically regarding the orbit of the two celestial bodies this should not be like this?
Is there somewhere a good source, ...
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votes
1answer
44 views
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 ...
4
votes
2answers
84 views
Is there a name for the star/supernova hypothesized to have been a precursor to the Solar System?
I found an article suggesting a supernova injected debris which helped nudge the formation of the Solar System 4.5 billion years ago.
I couldn't find a name for this hypothetical star/supernova after ...
5
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0answers
86 views
Which astronomer set his beard on fire because he left the cap off his telescopes finder?
There is a famous story of an experienced astronomer setting his beard on fire because he left the cap off his telescopes finder. I know it's said to be true of Galileo, but I thing it's relatively ...
2
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2answers
167 views
Old star vs New star
We know that with the passage of time, hydrogen inside (near or at the core) a star is converted to helium and other heavy elements via fusion. We can then deduce that the old sun contains heavier ...
24
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8answers
9k views
Simple experimental evidence that Earth revolves around Sun
What are the simplest experiments or calculations that give evidence that the earth revolves around the sun? Can you please explain them and reference the history? Many simple explanations such as ...
3
votes
0answers
59 views
Is there any formulae to calculate whether the sun will depress 18 degrees or more below the horizon on a certain day / location?
I'm trying to code a piece of software which will calculate some times for me that would greatly help me in my day to day but none of my formulae work if the sun doesn't go at least 18 degrees below ...
5
votes
1answer
48 views
How to calculate the time for the solar disk to pass the horizon and transit's lines
For a given date, longitude, and latitude:
Popular apps and websites give the time when the sun's center or edge is on the horizon (i.e., the time of sunrise and sunset) or its transit (i.e., ...
4
votes
1answer
71 views
How to compute the sun's (upper) transit
As detailed in https://physics.stackexchange.com/questions/41450/is-there-a-simple-accurate-formula-for-calculating-transit-times-from-rise-and, the sunrise, and set times can accurately be used to ...
4
votes
1answer
126 views
How can heavy elements exist when the universe is young compared to the lifetime of a star? [duplicate]
Our sun is said to be incapable of producing heavier elements, and these are thought to originate from older stars dying and going supernova. If our sun is 4-5 billion years old, and has a lifetime of ...
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1answer
40 views
How is magnetic field is generated over the sun?
Dynamo theory suggest how magnetic field generated on Earth. Due to flowing magma which contains molten iron generates magnetic field on earth. But how magnetic field is generated over sun?
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2answers
76 views
Is Limb Darkening because at centre we are directly looking core, whereas at limbs we are seeing only photospheric part?
Is limb darkening of the Sun because at centre we are directly looking the core and different zones, whereas at limbs we are seeing only the photospheric part (and less beneath photospheric part)? Or ...
47
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5answers
9k views
Why is moon light not the same color as sunlight?
The light from the moon is light being reflected from the sun. The sun, in space, is white. But on Earth, when the light is filtered through an atmosphere, the light appears yellow. So then, why is ...
3
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3answers
166 views
Will the Sun's solar wind push a permanent magnet out of our solar system?
If you were place a strong permanent magnet into the solar wind, like a 1 inch cube neodymium magnet, would the charged particles of the solar wind colliding with the magnet's magnetic field push the ...
