43 votes
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Are there any old/ancient star maps that we can compare to today’s and see drastic differences?

In practice, you're probably not going to get anything useful from ancient star maps, for several reasons: Very few of them actually survive from more than a few hundred years ago. Maps (and visual ...
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  • 14.9k
24 votes
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Looking for a detailed Milky Way map

It doesn't exist. It is actually rather difficult to see the shape of the milky way, because we are inside it. The more distant parts are obscured behind the nearer and very much of it is invisible. (...
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  • 91.5k
14 votes

Looking for a detailed Milky Way map

Since posting I was reading Galaxy Map and came across the Gaia star density map. I think this is pretty much suitable for what I need. It is a top-down map, based on the Gaia star density information,...
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  • 391
12 votes
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Radius to which all hydrogen-burning stars are known?

Your best bet is probably a distance-limited catalog designed to include everything within a specific distance. The most recent such compilation I'm aware of is Reylé et al. (2021), which has a limit ...
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  • 14.9k
6 votes
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I am looking for the SKYMAP Api (To create nightsky/star maps)

Those vendors don't need an API, and neither do you. What their "how it works" pages do talk about are star catalogs and map projections. The Bright Star Catalog has about 9000 stars down to ...
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  • 16.6k
5 votes

How do I make a custom pulsar map?

The pulsar map used by Pioneer and Voyager is a diagram of the position of the Sun relative to 14 galactic pulsars. It encodes their positions, distances, and pulse periods, which in theory makes it a ...
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  • 34.1k
5 votes
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What do the calendar rounds in Tomás Filsingers "Map of the Universe 2.000" mean?

The star map is centered at the north celestial pole. A thin red circle marks the celestial equator. The Roman numerals around the edge of the star map are hours of right ascension, measured along the ...
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  • 16.6k
4 votes

Is the pulsar map on the Pioneer/Voyager probes only meaningful for earthlings?

You aren't missing anything. The pulsar map is fairly useless unless the spacecraft is found within the next million years, when it won't have got too far from the Sun (the probes will have travelled ...
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  • 118k
4 votes
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Is this how stars’ right ascensions correlate to planets’ longitudes on a 2d map?

Most of your assumptions are correct. However, right ascension and declination are an equatorial system, while (heliocentric or geocentric) longitude and latitude are an ecliptic system. The reference ...
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4 votes

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

As long as we can live with a few tens of kilometers accuracy, we can treat the Earth's surface as a sphere. The subpoint of the object (the point on Earth at which the object appears at the zenith, ...
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  • 31.8k
4 votes

Looking for a detailed Milky Way map

The Star Trek sci-fi franchise has some maps of the milky way. Perhaps you could find them useful. Example
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  • 141
4 votes

Orientation of local star map

By inspection of a star charting app, I'd say the circles lie in the celestial equator, ie declination equal 0 degrees. Stars above the circles are to the north and vice versa.
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  • 4,065
4 votes

By type, how far out do we have good star maps?

Only rough numbers can be given and I would base them on the Gaia EDR3 catalogue since you are demanding that distances are known and no other big catalogue will have parallaxes (and hence distances, ...
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  • 118k
4 votes

In the Cambridge Star Atlas 2000.0, two of the horizon line labels are flipped on one side of the page. Typo, or is there a reason?

This is a typo. The 20N and 20S indicators circled are flipped. What follows is some intuition as to why we can know this is a typo at a glance: Look carefully at the 20S lines. If you draw a line ...
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  • 276
3 votes

Are there any old/ancient star maps that we can compare to today’s and see drastic differences?

The proper motion of most stars is extremely small, measured in milli-arcseconds per year, where an arcsecond is 1/3600 of a degree, and of course milli means a thousandth of that. One degree is 3,600 ...
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  • 150
3 votes
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What projection would I use to map the northern night sky onto a geodesic dome?

The mathematically ideal scheme would be a separate gnomonic projection (see Wikipedia or IMO) for each tile of the dome. Many planetarium programs implement this projection as an option. Fortunately, ...
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3 votes

How do I make a custom pulsar map?

The idea of a pulsar map that can be used anywhere in the Milky Way is probably a non-starter. Pulsars emit beamed radiation. That is, the radiation is restricted to a relatively narrow cone that ...
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  • 118k
3 votes

Looking for a detailed Milky Way map

You might be happy with the Reid and Zheng maps (available at several resolutions, with or without coordinate frames, with or without the sun, and also from an oblique angle). Their preprint ...
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2 votes

How can you determine the date using nothing but a star chart from the day and the time?

The way the star chart is drawn, the points labeled 1 and 3 are on the celestial equator, the 0 degree declination reference. The tip-off is that a line between them passes through Orion, the top-...
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  • 1,258
2 votes
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How can I calculate the apparent position of stars as seen from a location on Earth at a specific time?

There is doubtless a way to do it in AstroPy, but in case you’re interested, the Skyfield library both supports the operations of loading the Hipparcos catalog and computing apparent coordinates. Here ...
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2 votes

How to create unique 3d star maps?

If you don't mind doing a bit of math and/or some light programming, it's not all that hard. The position of stars is defined by declination and right ascension and, of course distance. ...
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  • 22.9k
2 votes

How to create unique 3d star maps?

I hope the following doesn't come across as self-promotion, but you can have a look at the source code for my near-space 3D map: http://beyondproxima.com/ Just View Page Source. It's not perfect - ...
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  • 374
2 votes

Binocular-friendly star map to find the Recurrent Nova RS Ophiuchi?

Part of the fun of variables stars is watching them fade or brighten and have an idea of the magnitude of the variable. The AAVSO (American Association of Variable Star Observers) website can create ...
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  • 7,180
1 vote

What are the various ways we can quickly generate custom star charts to find moving asteroids or comets in binoculars and telescopes?

Cartes du Ciel Let's say that you want to plot the positions of the comet C/2021 A1 (Leonard). (First, make sure the program knows of its existence: Click the "Update" menu and then click &...
1 vote

By type, how far out do we have good star maps?

There is a question on a related topic: Why aren't new stars in Earth's relative proximity constantly discovered? I quote from my answer: The 1991 third Gleise catalog of stars within 25 ...
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1 vote

How well have we mapped our local neighborhood of stars?

One way for you to find out would be to look at lists of stars within varius distance limits of Earth. For example Wikipedia has: https://en.wikipedia.org/wiki/List_of_nearest_stars_and_brown_dwarfs ...
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1 vote
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Binocular-friendly star map to find the Recurrent Nova RS Ophiuchi?

Pretty useful website is spaceweather.com. It features an archive, which is available here for August 9, 2021, when they published an article about the nova. Right before the 'Update' section there ...
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  • 2,844
1 vote

Binocular-friendly star map to find the Recurrent Nova RS Ophiuchi?

You could generate one with Stellarium. Using the tools in the top right you can create a "telescope" with the right field of view. I used one with a 50mm diameter, and a focal length of ...
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  • 91.5k
1 vote

Are there any old/ancient star maps that we can compare to today’s and see drastic differences?

Are there any old/ancient star maps that we can compare to today’s and see drastic differences? Yes, we can! Well, depending on some definitions (e.g. “star”, “map”, “drastic”). The universe is not ...
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