What does the solar analemma on earth look like at the equator? Some web...
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...
View ArticleHow much mass does the Sun gain from the Poynting-Robertson effect?
I understand that the Poynting–Robertson effect describes solar radiation-induced drag on certain sized dust particles, causes them to lose orbital angular momentum and eventually fall into the Sun.But...
View ArticleWhere 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 lost...
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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...
View ArticleHow did ancient models explain 6 months of day and night at the respective...
We know that the Arctic circle experiences 6 months of continuous day light during the sun’s apparent northward journey (to the solstice) and vice verse for the Antarctic region. This is attributed to...
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How to design a static heliostat?
An heliostat is a device capable of reflecting the sun in a fixed point while the sun itself moves into the sky, thanks to a moving mirror.But this company astonished me with its invention: a static...
View ArticleFor the SST/CHROMIS H-β spectral line at 4846 Angstrom (Å), what is the...
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?
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Calculating Earth-Sun distance only using trigonometry and terrestrial...
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...
View ArticleIf the Earth is rotating counter clockwise, how does the sun rise from east?
I was very confused when I watched this video from 2:18 till 2:45. And it seems very clear that if the Earth is really rotating from west to east, shouldn't be the Sun rising from west and setting in...
View ArticleAt 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...
View ArticleEarth 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...
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What objects (if any) are there above or below the ecliptic, or just...
Per the eclipticPlane of the Solar System. Most of the planets orbit the Sun verynearly in the same plane in which Earth orbits, the eclipticSo, what I am imagining is that there is a imaginary huge...
View ArticleCan a lunar eclipse happen at night and be followed by a solar eclipse the...
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?
View ArticleHow did the ancients know the constellation in which the sun is located?
The zodiac constellations lie along the plane of the ecliptic. In Spring equinox, sun lies in Pisces constellations. So Pisces is not visible during the day (because the sun light) and not visible in...
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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
View ArticleWill 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...
View ArticleWhat 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 the...
View ArticleSun 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...
View ArticleUnknown 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...
View ArticleWhy are the solar prominences visible during a total solar eclipse - 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...
View ArticleThe 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} \,...
View ArticleIs there any way to know how much time of totality is experienced during a...
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 time...
View ArticleIs it possible for both transition points in a hybrid eclipse to occur so...
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...
View ArticleIs there a known magnitude of the sun that needs to be covered for the...
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...
View ArticleDoes the minus sign in the path width section on NASA’s Five Millennium Canon...
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,...
View ArticleWhy is there a year 1 B.C., a year 0, and a year 1 A.D. in NASA’s Five...
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...
View ArticleIs It Possible to See the Sun's Corona Appearing to Flare Out From Behind the...
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...
View ArticleClosest/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...
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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
View ArticleWhat is the difference between a solar eclipse's (a) magnitude and the (b)...
After watching a Smarter Every Day 2 YouTube video featuring Gordon Telepun, I purchased his ebook Eclipse Day 2024 and More off the Google Play store. In the book, he has a link to Xavier Jubier’s...
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