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Questions tagged [night-sky]

Questions regarding the visible night sky during nighttime from Earth.

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2 votes
0 answers
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Light flashes in night sky with a ~14 second period?

Last Sunday (23rd of June) I observed flashes of light during a field trip in the night sky with a period of approximately 14 seconds. I timed the interval between flashes with a stopwatch a few times,...
Rafa's user avatar
  • 371
0 votes
1 answer
118 views

Can anyone point me to pictures of a region of the night sky during a total eclipse and with the sun not present?

Can anyone show me where I can find at least one photograph of the region of the night sky during a total eclipse and another at night with the Sun not present? I'm interested in the data that ...
Ted Jackson's user avatar
0 votes
1 answer
47 views

What year will Gamma Cephei become the North Star?

I tried googling but I couldn't get any exact year, just any time between 3000 and 3100 CE. I want to know the exact year the north pole becomes closer to Gamma Cephei than Polaris. Apparently Polaris ...
Papa Solen'ya's user avatar
23 votes
3 answers
8k views

Why wasn't the planet Uranus recognized by ancient cultures?

Mercury, Venus, Mars, Jupiter, and Saturn have been identified by ancient astronomers as they are visible with naked eye at night. The planet Uranus, despite being visible during very clear nights, ...
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1 vote
1 answer
101 views

Orion constellation shape

In textbook "Orion constellation the four bright stars appear to be arranged in the form of a quadrilateral" and I found in internet when I searched "Four stars Rigel, Betelgeuse, ...
Nandy's user avatar
  • 21
2 votes
0 answers
104 views

Calculation of twilight sky surface brightness based on object's apparent magnitude

I would like to be able to compute the sky surface brightness, which is based on the object's apparent magnitude. We have formulas, which allow us to compute the sky surface brightness based on the ...
Geographos's user avatar
1 vote
0 answers
74 views

i’ve seen an orange, slow blinking object in the sky

it’s new year’s day and people are setting off fireworks and it’s a fairly clear sky tonight, and a weird orange slow blinking light was going eastwards. it wasn’t fast enough to be a plane, and i am ...
soluxus7777's user avatar
0 votes
1 answer
250 views

Steadily bright light, moving in sky before sunrise

This morning at 5:50a ET I saw a steady bright white light in western sky, approx 270 degrees heading straight east. This was a steady light, no fluctuation of any kind, no nav lights. Much higher ...
JMowery007's user avatar
0 votes
0 answers
80 views

What were these lights in a line in the sky? [duplicate]

Hello dear astronomy community, On September 7 at 8:00pm me and my friend were hiking towards the Hollywood sign. We noticed roughly 10-15 bright lights moving in a line on the sky. That was very ...
Richard's user avatar
4 votes
4 answers
5k views

What is the ring of light around the moon and which star seen near it?

In this amatuer photograph, the following are to be noted: There is a faint ring of light around the moon. What is the distance we see this at. From the ground it looks like a hundred meters. There ...
Nick's user avatar
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1 vote
2 answers
165 views

How bright would an object need to be in order to block out stars at night?

I am wondering just how bright a star or other object would have to be before it starts blocking out the night sky. I'm looking for an answer in apparent magnitude. I'll note the Full Moon gets to ...
DrZ214's user avatar
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6 votes
1 answer
305 views

Is there a star everywhere you look?

What % of the sky is occupied? Intuitively, when you look up at night most of the sky is black "space". Of course, our eyes are not very sensitive, so that's a dubious measurement. Imagine ...
gomennathan's user avatar
1 vote
0 answers
54 views

How to find the constellation in which the sun is located using the night sky map?

The following sky map was given as part of practice problems in my Astronomy course The moon is in its first quarter phase. I am supposed to find the approximate date and time of the year in which ...
QFTheorist's user avatar
0 votes
0 answers
98 views

Bright out north Idaho

It is Oct 9th 10;30- 11:00 pm. I'm in Northern Idaho and it is as bright as it would be with a full moon (or brighter). The moon is going to be new in a few days and the sliver as it is won't be out ...
Trevor Dunnett's user avatar
1 vote
1 answer
124 views

Identify the bright object to the left of the moon

I'm seeing the sky at 23:00 on September 29, 2023, from the east of Algeria's point of view. To the left of the moon, there is something very bright. I need to confirm if it's Jupiter? (My camera ...
Mr Saw's user avatar
  • 13
0 votes
1 answer
1k views

Seen over 15 strange lights flying in a straight line [duplicate]

At about 9:30pm on 9/4/2023 in the Dayton Ohio area went out on the back porch and look in the sky and I noticed one light flying in a straight line across the sky and it was going at a fast speed and ...
James 's user avatar
  • 11
11 votes
3 answers
3k views

How much do the constellations change if the viewpoint moves within a solar system?

My question is pretty simple. How would the night sky change if you were in a different planet within the same solar system? Specifically the fixed stars. Would the constellations be essentially the ...
skout's user avatar
  • 309
2 votes
1 answer
278 views

What would the night sky look like after 200 years?

It is research for a book I am writing. The year is 2200. Assume the volume of items in orbit has increased dramatically from today’s numbers. We go to war and blowup all the satellites. Four hundred ...
Ken's user avatar
  • 37
6 votes
1 answer
300 views

Sky surface brightness vs magnitude limit visibility

I am wondering how we can calculate the magnitude limit of the celestial object, which could be visible at the given sky surface brightness conditions. We already know that Venus and Jupiter are ...
Geographos's user avatar
0 votes
1 answer
135 views

If Earth's rotational speed is zero at the North Pole, why do stars still have apparent motion?

The apparent motion of stars (and other objects) results from Earth's spin on its axis, hence the rising and setting of some stars, and the circumpolar nature of others. If the ground is not moving ...
William's user avatar
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4 votes
1 answer
218 views

Sky density of milky-way stars vs external galaxies

I am interested to know if any particular slice of sky contains more galaxies or more stars (in the milky way, although would be interested to factor in extra-galactic stars, and even rogue planets) ...
Rabbi Kaii's user avatar
3 votes
1 answer
112 views

Names of the galactic backdrop

I am wondering what are the various names given to the plane of the milky way. I am looking for a specific one I once heard, and will likely recognise when I see it. If I can explain better with a ...
Rabbi Kaii's user avatar
1 vote
2 answers
373 views

How many planets can be seen by the naked eye? [closed]

I can see Venus and Mars, what about the others?
abc's user avatar
  • 145
-1 votes
1 answer
273 views

Do planetary hours have any real astronomical basis? [closed]

Planetary hours are an ancient theory that each of the 24*7 hours of the week is "ruled" by a certain celestial object in the solar system. Among other consequences, this theory gave rise to ...
0x60's user avatar
  • 115
-3 votes
1 answer
449 views

What were the two bright dots that showed up near Jupiter and vanished after seconds? [closed]

I saw two bright lights near Jupiter and I’m pretty sure that it wasn’t just an airplane. It had almost the same level of brightness as Jupiter, and I was wondering what it could be. Can anyone ...
Muhammed Safvan's user avatar
4 votes
1 answer
233 views

How do I know that I’ve found Neptune?

So, recently I went out for a look at Neptune with my telescope and I found the general area of where Neptune was. However, when I took a see for myself, there were a ton of blue stars everywhere and ...
Prince Pugs's user avatar
2 votes
1 answer
389 views

Will the stars dim in the future because of the expansion of the universe?

We know that the universe is expanding, and that means everything is spreading apart. So does that mean in the future all the stars will dim and eventually disappear in our night sky because of the ...
Prince Pugs's user avatar
1 vote
0 answers
483 views

What was this "light" that looked like a star moving repeating from point A to B for about 5 mins [duplicate]

I was looking in the sky one night about 9:45. There was what looked to be a shooting star but much slower and brighter more like a satellite. It was moving (from standing on earth) it looked like a ...
DJ7420's user avatar
  • 27
14 votes
2 answers
9k views

What could be an explanation for a satellite-like moving light in the night sky that dims over time

Last night I saw a bright light moving across the sky. It was probably as bright (or even brighter) than some of the brightest visible stars like Vega and moving quite slowly (so no shooting star) at ...
299792458's user avatar
  • 343
14 votes
2 answers
812 views

How bright would the night sky be in the galactic center?

Given that the star density within a parsec of the center of the Milky Way is about 10 million stars per cubic parsec, how bright would the night sky be if you were on a rocky planet within that ...
Filip Milovanović's user avatar
8 votes
1 answer
1k views

How am I supposed to locate the planets Uranus and Neptune with a 70 mm f/5.7 refractor?

I can locate all of the planets other than Uranus and Neptune. This is mainly because they are very dim and I live where there is just enough light pollution so that I can't spot them. I have a Gysker ...
Oscar's user avatar
  • 99
10 votes
1 answer
11k views

What is this, red, blue, white twinkling, star? [duplicate]

I am from Germany and at 11 PM I was outside and I saw a star, rapidly twinkling in blue, red and white. At first, I thought it was a plane, but it didn't move. I took a picture of it, but you can ...
bratbruh's user avatar
  • 101
2 votes
0 answers
90 views

How to get high-quality sky image for specific location & date

I'm working on an ink drawing album cover inspired by this Frank Hurley photo from the First World War, and want to put an accurate starry sky behind it in my album artwork.: The tower in the image ...
S. Imp's user avatar
  • 395
6 votes
1 answer
125 views

Making an application to draw the night sky of other planets

I'm making an application for drawing a night sky of planets other than Earth. Ultimately my app may be used to draw a night skies of a hypothetical planets in other solar systems. I'm doing it ...
Felix.leg's user avatar
  • 221
1 vote
1 answer
104 views

What is Canopus in this picture?

Picture is taken from 34.2N 126.6E Bogil-do, South Korea. I suppose the dot at up-right side is Rigel and the bright white dot is Sirius, and bright reddish dot at the bottom is light from some ...
Hongjun Chang's user avatar
0 votes
0 answers
181 views

looking for a plugin or API for Moon-phases and sky-map

I want to create a website that contains star maps and moon phases like mapiful and thatverynight but couldn't find any helpful APIs or plugins. Can anyone help? thanks
JSK's user avatar
  • 1
3 votes
1 answer
174 views

Why does light pollution make the night sky completely black without stars?

I have seens pics of the night sky in areas that naturally have little population like deserts, cold regions and forests and the night sky is slighly bright and colored by shades of blue, red, purple ...
user44346's user avatar
4 votes
2 answers
3k views

How can we know if a star which is visible in our night sky goes supernova?

Let's say there is a star about 3000 light-years away from earth visible in our night sky. If this star were to go supernova tomorrow(not relative to earth's night sky), we would know about it 3000 ...
Schwarz Kugelblitz's user avatar
0 votes
2 answers
324 views

What is use of Greek Letters in Astronomy? [closed]

We see letters such as $\epsilon$ or $\alpha$ or $\beta$ or $\eta$ etc... (possibly all Greek letters) Can Somebody state the use of all Greek letters in astronomy?
Hi-Tech's user avatar
  • 11
1 vote
1 answer
139 views

What are the aspects does the moon differs between cities located on the same latitude?

What are the aspects does the moon (astronomical position and other astronomical aspects) differs between cities located in the same latitude? - For example: Seattle, Munich, Vienna, and Ulaanbaator ...
huab's user avatar
  • 143
1 vote
1 answer
160 views

Star visibility above horizon map likewise day & light map or moonlight world map

I am looking for an option to present the given star visibility world map likewise day & night map or moonlight world map like below: Question: Is it possible to generate a map like this for some ...
Geographos's user avatar
12 votes
2 answers
2k views

Will Starlink deface the night sky?

There is some discussion (and there are some questions on this site) about the impact of Starlink on observational astronomy. I am not an astronomer, but I am amazed by the beauty an immensity of the ...
henning no longer feeds AI's user avatar
5 votes
1 answer
374 views

Naked-eye limiting magnitude: mismatch between Wikipedia, online converter and Shaefer's formula

I'm trying to make sense of the difference between the reference Sky Quality Meter (SQM) readings given in the Wikipedia article on Bortle scale, online converters like [1] that are based on Shaefer's ...
Ruslan's user avatar
  • 967
2 votes
2 answers
72 views

Will the night sky ever be more stars than darkness? [duplicate]

Given enough time, will enough light from distant stars reach Earth so that our night sky will be more than 50% stars?
Abhigyan Kumar's user avatar
4 votes
3 answers
500 views

Density of stars on celestial sphere

The pattern of stars on the surface of the celestial sphere seems perceptually to have an universally looking structure. If you pick a region of the sky at random, for instance by using the (excellent)...
meduz's user avatar
  • 345
3 votes
1 answer
107 views

Star Map Vs Star Catalogue vs Planetarium Software

What is the difference between a star map, star catalogue and the sky provided by planetarium software? I have read the wiki but was having a hard time understanding how the data, accuracy and detail ...
RBz's user avatar
  • 131
2 votes
1 answer
558 views

How do I find out when a constellation reached its zenith?

I found this website to look at the sky at the specific time and location: http://www.fourmilab.ch/cgi-bin/Yoursky - you can insert latitude and longitude and time to see how the skies looked at any ...
Dmitriy Isakov's user avatar
3 votes
1 answer
56 views

Is sky-glow affected by height?

I'm an architecture student and my graduation project will consist of building a research center for outer space, my question is whether or not height would affect sky-glow or not ? Thanks in advance, ...
Shadi Amr's user avatar
5 votes
2 answers
1k views

Is there a webpage that shows the night sky but can filter out dim stars?

This webpage is very good for viewing the night sky and learning the names of the stars Timeanddate - Astronomy However, it shows too many stars. Because I live in the city, I can only see about 50 ...
bobsmith76's user avatar
2 votes
0 answers
79 views

What is the average luminance of the star background?

What is the luminance of the star background, i.e. of all the objects outside of the Solar system? E.g. if we measured average luminance of the sky from the far side of the Moon (so that solar and ...
Ruslan's user avatar
  • 967