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Questions tagged [the-sun]

Questions regarding the closest star to Earth, at the centre of the Solar System.

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3 votes
1 answer
129 views

Are these craters on the moon during eclipse

can somebody confirm that what im looking at are craters on the moon? This was taken during the 2024 eclipse from illinois with my S24 ultra iso250 115mm -2.0ev F3.4 speed 1/10000. thanks
SupaD75's user avatar
  • 41
2 votes
0 answers
72 views

Closest/farthest point where the sun stops being the brightest star?

Which is the closest point to the Sun where it's not the brightest star anymore? My intuition is that this is either on a direct line between the Sun and Alpha Centauri, or between the Sun and Sirius ...
Michael Borgwardt's user avatar
1 vote
2 answers
92 views

Is It Possible to See the Sun's Corona Appearing to Flare Out From Behind the Moon During a Total Solar Eclipse?

I am not an astronomer, but witnessed the last two US total solar eclipses -- the first from a farm in Hopkinsville, Kentucky on August 21, 2017, and the second last Monday from Klyde Warren Park in ...
RodneyS's user avatar
  • 11
-1 votes
0 answers
67 views

Does the minus sign in the path width section on NASA’s Five Millennium Canon of Solar Eclipses have any meaning?

I was looking through NASA’s Five Millennium Canon of Solar Eclipses and I am a little confused by the notation for several. In the “Path Width” column, 87 entries have a “-” in the cell. To be sure, ...
Curious Layman's user avatar
16 votes
2 answers
5k views

Why is there a year 1 B.C., a year 0, and a year 1 A.D. in NASA’s Five Millennium Canon of Solar Eclipses?

I was looking through NASA’s Five Millennium Canon of Solar Eclipses, and I am really confused by the fact that there is a year -1, 0, and 1. I was always taught that there was no year 0, that we just ...
Curious Layman's user avatar
0 votes
0 answers
27 views

Is there a known magnitude of the sun that needs to be covered for the diamond ring effect or Bailey’s beads to occur?

During a total solar eclipse, there is this brief, roughly 1-20 seconds during which some absolutely incredible, indescribable phenomenon occurs. It was the most beautiful thing I have ever seen. They ...
Curious Layman's user avatar
0 votes
0 answers
30 views

Is it possible for both transition points in a hybrid eclipse to occur so close together they can be seen from the same spot on earth?

There are 4 categories of eclipses. There are partial, annular, total, and hybrid eclipses. In a partial eclipse, part of the moon covers the earth casting its penumbra on earth. Judging from my ...
Curious Layman's user avatar
0 votes
0 answers
23 views

Is there any way to know how much time of totality is experienced during a hybrid eclipse in NASA’s 5 Millennium Canon of Solar Eclipses?

I was just looking through NASA’s 5 Millennium Canon of Solar Eclipses. It’s really a fantastic list, having the max time of totality and all. I was trying to figure out what the maximum amount of ...
Curious Layman's user avatar
3 votes
2 answers
283 views

The sun path angle of elevation

It is well known that the formula for the sun path azimuth $\alpha_\text{s}$ (assuming that $\alpha_\text{s} = 0$ for noon) is $$\alpha_\text{s}(\gamma_\text{s}) = \arccos \frac{\sin\gamma_\text{s} \, ...
Pygmalion's user avatar
  • 135
10 votes
4 answers
2k views

Why are the solar prominences visible during a total solar eclipse - orange? Is the sun orange?

This question is really about the color of the sun. But NOT about its color at sunrise or sunset. When I search for the color of the sun, I find dozens of articles, including many on SE, stating that ...
George Lee's user avatar
3 votes
0 answers
92 views

Sun and moon same angular radius - how unlikely is this?

How many planets do we expect, statistically, in the universe, have a sun and a moon with such a similar angular diameter as we do on earth? How many habitable planets? Is it possible to calculate ...
Rabbi Kaii's user avatar
4 votes
0 answers
92 views

Unknown satellite transit during solar eclipse on April 8, 2024

While viewing the April 8, 2024 solar eclipse from Jackson, MO, when the moon had eclipsed about 20% of the sun (the bottom-right part), my friend and I both observed with our naked eyes (behind solar ...
Tyson Williams's user avatar
15 votes
2 answers
5k views

What caused pink flares during the eclipse

During the solar eclipse totality, I noticed pink lights on the rim around the moon. In a telescope, they were obviously flare like. Id like to know what causes them to have that color. Not knowing ...
Cort Ammon's user avatar
3 votes
2 answers
624 views

Will Earth become a gas giant when the Sun expands in 5 billion years?

Because if the Sun expands to 1 AU or very close to it, its density and hold on outer layers will be much weaker so a dense object like the Earth can slowly absorb material because Earth would be much ...
MiltonTheMeme's user avatar
1 vote
1 answer
72 views

How can I plot a rotary cam for the equation of time? [closed]

I'd like to use Solidworks to create a cam (peanut looking) for computing the equation of time in a pocket watch. Would appreciate any point to the right direction or advice. Audemars Piguet EoT
noob_watchmaker's user avatar
8 votes
3 answers
4k views

Can a lunar eclipse happen at night and be followed by a solar eclipse the next day?

Is it possible for a lunar eclipse to occur during the night and then be followed by a solar eclipse the next day? Could these two events happen consecutively, and if so, how rare is this phenomenon?
Kala Bicho's user avatar
1 vote
2 answers
78 views

What objects (if any) are there above or below the ecliptic, or just vaccum/gases

Per the ecliptic Plane of the Solar System. Most of the planets orbit the Sun very nearly in the same plane in which Earth orbits, the ecliptic So, what I am imagining is that there is a imaginary ...
puzzled's user avatar
  • 617
14 votes
1 answer
3k views

Earth is Tilted, but in reference to What Object / relative to what?

I am asking basic question on trying to understand on tilt. I know if I (as a human) tilt when standing on feet, my tilt will be in relation to gravity. For Earth, I am not able to understand, what is ...
puzzled's user avatar
  • 617
9 votes
5 answers
3k views

At 45°N, how come the Sun rises in a northeasterly direction?

As per title, I'm having trouble understanding how it's possible for a person at 45°N to see the Sun rising in a northeasterly direction for 6 months of the year. Even during the summer solstice, the ...
Adrien Hingert's user avatar
6 votes
2 answers
474 views

Calculating Earth-Sun distance only using trigonometry and terrestrial measurements

I have an interest in mathematics and astronomy, and my curiosity was piqued by the methodologies employed in contemporary solar distance measurement. Current practices use sophisticated instruments ...
Parseval's user avatar
  • 163
0 votes
0 answers
29 views

For the SST/CHROMIS H-β spectral line at 4846 Angstrom (Å), what is the difference in solar altitude observed at wavelengths differing by ±0.1 Å?

For the SST/CHROMIS H-β spectral line at 4846 Angstrom (Å), what is the difference in solar altitude observed at wavelengths differing by ±0.1 Å?
Isomorphism's user avatar
2 votes
1 answer
108 views

Details of the Moon's night photographed in a total solar eclipse

I didn't know that in photographs of total solar eclipses you could see details of the Moon's night. To my surprise, look at this beautiful photo of the solar eclipse of 2024/04/23 taken by amateur ...
Albert's user avatar
  • 1,962
5 votes
1 answer
1k views

Sun moves relative to the stellar background?

I just got reading this book- "Astronomy - Principles and Practice 4th ed. - A. Roy, D. Clarke" and I got stuck at the following bold lines (I am providing the full text for context to my ...
Cuckoo Beats's user avatar
7 votes
1 answer
154 views

Attempting to plot solar terminator using Python and Skyfield library

Problem I would like to plot the small circle defining the visible portion of Earth for an observer at position $P$ away from the Earth, on a 2D map. In the case of the Sun, this would be the solar ...
Hunter's user avatar
  • 321
7 votes
1 answer
143 views

Where will all atoms on the Earth end up when the Sun engulfs the earth?

I am curious about what will happen to all atoms on the Earth including all of our atoms after the Sun engulfs the Earth? Will they become the part of the Sun's white dwarf? Or most of them will be ...
tvd's user avatar
  • 71
7 votes
1 answer
2k views

How would radiation pressure inside of the Sun affect an indestructible person?

I went down something of a rabbit hole regarding whether an indestructible person trying to walk on the Sun would fall in, and sink. I want to know how radiation pressure would affect that person. As ...
PhysicsNoob's user avatar
4 votes
2 answers
306 views

What does the solar analemma on earth look like at the equator? Some web sources seem to indicate it is a horizontal line. How can that be?

I'm finding several sources on the internet which say that the solar analemma at the equator is a horizontal line, but this makes no sense to me, especially the analemma at noon, for which the sun ...
Still curious at 82's user avatar
1 vote
0 answers
51 views

How is the amount and direction of the Sun's axial tilt as observed from other planets calculated?

Not long ago I asked this question; turns out that was fairly simple to figure out given the equatorial coordinates of the Sun's north pole (just convert to ecliptic coordinates, and see when the Sun ...
Outis Nemo's user avatar
9 votes
1 answer
1k views

What is the solar diameter?

What is the solar diameter in SI units? Google tells me this is 1.3927 Gm. How accurate is that figure? I am looking for estimates with referenced data and calculations, and the uncertainties: due to ...
David's user avatar
  • 337
6 votes
1 answer
447 views

What were the specifics of the photos taken by Sir Arthur Eddington during the Eddington expedition that supported Einstein's Theory

I know that Sir Arthur Eddington went to South American to photograph stars around an eclipse to see if they seemed to change position when the light past by the Sun relative to when the light didn't ...
Elliott Cooper's user avatar
6 votes
3 answers
1k views

What is the meaning or information given by the solar image at 4500Å?

On the latest solar images from NASA, there is one picture lablled "continuum 4500 Å". There are bands diagonally in the picture as well. What is the ...
not2qubit's user avatar
  • 225
1 vote
0 answers
115 views

Determining Time Based on Arc Seconds

So our arc day starts at 20°41'32 which is midnight (0:00) and ends 24 hours later at 21°42'42. According to my calculations it traveled 0 degrees, 59 minutes, and 30 seconds or 3570 arc seconds in 24 ...
dimitri33's user avatar
  • 167
2 votes
2 answers
299 views

Could UV-A imaging sensor reasonably see a total eclipse in progress through clouds?

Let's suppose the ultimate disaster occurs... you've blown several thousand dollars on travel & lodging to view an eclipse, and now... minutes before the big event... the sun is behind a cloud. ...
Bitbang3r's user avatar
  • 121
2 votes
1 answer
148 views

On what four dates dates do we observe the minimal, maximal, and two days of zero Solar axial tilt relative to us?

In case the title is a bit confusing, what I'd like to know is essentially respectively on which dates the Solar axial tilt is pointing straight towards Earth, straight away from Earth, and ...
Outis Nemo's user avatar
1 vote
0 answers
56 views

Tracking the position of the sun at various times of the day and night for a particular location

I am looking for a website that will provide me with the degree above and below the horizon of the position of the sun at various times of the day and night for a particular location. looking for ...
sunwatcher's user avatar
4 votes
2 answers
135 views

Resolving variance between Skyfield-generated sun vectors and test data when both use same ephemeris

I have two functions that get TEME and GCRS Earth-Sun position vectors using Skyfield: earth_sun_vectors.py ...
Michael Bonnet's user avatar
1 vote
1 answer
112 views

calculating apogee and perigee for moon and sun

The perigee does not necessarily happen when we have a full moon, using swevents we can easily determine the moon phases. Now can we use python to determine when ...
dimitri33's user avatar
  • 167
1 vote
0 answers
50 views

Looking for data and models for events of Sun and Moon apparent motion in distant past?

For the current Julian Era (from 1, 1, 4713 BCE to modern day), I am looking for a raw data tables or a model that allows to predict the following events related to apparent motion of Sun and Moon: ...
Suiinditor Impudens's user avatar
4 votes
1 answer
165 views

Fixing satellite eclipse equations from textbooks that are seemingly failing

I have tried implementing equations from two different textbooks in Python to find if a satellite is in eclipse, but both fail a significant percentage of the time when tested against data from ...
Michael Bonnet's user avatar
0 votes
3 answers
6k views

Is it possible to view the sun and moon in the sky at the same time?

I'm writing a story. I want my ending to have the sun and moon visible in the sky at the same time. It is symbolism for the larger story. Is this possible? I have tried searching and can't find ...
CJ Winters's user avatar
5 votes
2 answers
3k views

The star that created our sun

Is the location of the star that would have created our sun known? Meaning our sun's parent star which would have provided the material when it died? If not, has there been any theories on what kind ...
eBookworm's user avatar
  • 145
0 votes
0 answers
65 views

Flux from the Sun on the Earth using the Stefan-Boltzmann law

What is wrong with this computation, plase? I am getting the result of 4291.65 W m^{-2} instead of 1361 W m^{-2}. Thank you very much ...
Anna-Kat's user avatar
  • 505
3 votes
3 answers
697 views

Integration of Plank curve of the Sun

Why I did not get the value of 1361 W m^{-2}, please? I am getting 2.0125538614437745e-47. ...
Anna-Kat's user avatar
  • 505
8 votes
1 answer
3k views

Why did the dust between the planets disappear during the birth of the solar system?

I'm catching up on my childhood mistakes. One of them was the "nuclear flash", the enormous explosion when the sun ignited. Apparently, this did not happen as the ignition of the sun was a ...
Dominique's user avatar
  • 445
2 votes
1 answer
74 views

Equation for calculating boolean answer to "is this Earth satellite in eclipse"

I have found plenty of math for determining duration of satellite eclipse, but I am having trouble finding an equation that produces a simple boolean answer to the question "Is this Earth ...
Michael Bonnet's user avatar
2 votes
1 answer
375 views

How did the temperature of the solar system evolve?

As a child, I've read that stars ignite during a so-called "nuclear flash". I understood this as a very violent outburst of energy from the sun, causing all dust between the protoplanets to ...
Dominique's user avatar
  • 445
1 vote
0 answers
70 views

is there anything that might cause a planet to stop getting sunlight permanently, or to only have light infrequently? (on the whole planet or part)?

(writing a story) Is there anything that might cause all or part of a planet to stop getting sunlight, or to have a permanent/ridiculously long-lasting perpetual twilight? nuclear winter? volcanic ...
Zeantra's user avatar
  • 11
1 vote
1 answer
200 views

How close can Venus be to the sun in the sky and still be visible to the naked eye?

Assuming no artificial light, what is the minimum number of degrees apart would the sun and Venus have to be during the beginning of civilian twilight for the planet to be visible to the naked eye to ...
Bob516's user avatar
  • 1,467
2 votes
0 answers
70 views

How is an index of n=0 possible for the Lane-Emden equation?

I was recently showing that an index of $n=0$ for the Lane-Emden equation results in constant density throughout the star. However, in my calculations I had to use the constant $\alpha$ which can be ...
Kian31's user avatar
  • 21
1 vote
1 answer
110 views

Why does the sun appear on the screen behind an eyepiece when doing solar projection?

I've seen Youtube videos explaining how to "safely" observe the sun by projecting an image of the sun onto a piece of cardboard behind the eyepiece of a refracting telescope or binoculars. ...
yippy_yay's user avatar
  • 275

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