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30 votes
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How did the ancient Greeks measure celestial angles?

In his Mathematical Syntaxis (better known as the Almagest), Ptolemy details the construction of three instruments: the plinth, the parallactic instrument, and another which he calls “astrolabe” but ...
Pierre Paquette's user avatar
23 votes
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What is this "Table of astronomy" about?

Fig. 1 and many others on that page seems to be diagrams of various trigonometric relations, used e.g. to convert between coordinates of celestial objects. But I'm not sure about this particular one. ...
pela's user avatar
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16 votes
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Finding a paper that has only abstract on ADS

The reason there's only an abstract on ADS (or really just a partial abstract -- you can find the entire abstract in Google Books) is that the work was never published as a paper during the lifetime ...
HDE 226868's user avatar
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8 votes

Where can I find the positions of the planets, stars, moons, artificial satellites, etc. and visualize them?

To add to the excellent answer by barrycarter, there are 2 planetarium-like codes, that I know of, that run on a mac and would make excellent tools for viewing certain astronomical objects. The codes ...
Natsfan's user avatar
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8 votes
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"Table of Astronomy's" depiction of the solar system models

Ptolemaic system Planets In Ptolemy's system, the two missing symbols are Venus (♀) and Mars (♂), respectively. The arc in the bottom of the Venus symbol actually belongs to Mercury below (☿). ...
pela's user avatar
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7 votes
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Any book on `How do they know it (in Astronomy)`?

There are books that treat the general history of astronomy, such as those mentioned in the previous post. The History of Astronomy: A Very Short Introduction by Michael Hoskin. History of Astronomy ...
7 votes

Should I drop source shot noise from the SNR calculation when all I care about is detection (not photometric precision)?

Assuming you know the position of the source: You collect a certain number of counts within an aperture (which could be modelled on a point spread function). You can then test the hypothesis that this ...
ProfRob's user avatar
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7 votes
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What is the mass of exoplanet HD 100546b?

The wikipedia article is a bit of a mess, but the Nasa value is utterly unreasonable. 752 is 10 times more massive than the minimal mass for a star, and any body with that much mass would be a star ...
James K's user avatar
  • 126k
6 votes

Studies on planets without parent star

It would be more accurate to call them surveys than studies. A study looks at an object in detail. A survey counts and categorizes objects. Rogue planets are enormously difficult to see, and only ...
userLTK's user avatar
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6 votes
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How many meteorites have been found some place other than Earth? Where is an authoritative list maintained?

Finally, I managed to find such list (and even more): Meteoritical Bulletin. You can search for every location where at least one meteorite was found (including Mars and Moon). You can also choose ...
User123's user avatar
  • 2,879
6 votes
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What is the best database for identification of spectral lines?

There is the NIST Atomic Spectra Database where you could browse by elements. This the reverse approach, meaning that you have to first query element by element and then see which of the lines you ...
B--rian's user avatar
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5 votes
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On Augustus' Actual Prescription to Restore the Julian Calendar to Accuracy

8 AD was definitely a leap year. It was believed since Scaliger that the leap year sequence was (45), 42, 39 ... 12, 9 BC, AD 8, 12 ... This was based strictly on sources in literature. Chris Bennett ...
Teemu Kalvas's user avatar
5 votes
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Are there interactive maps for comets?

Unlike an eclipse, which is only visible for a specific area and at a specific time (which can be predicted in advance), comets can be seen over a wide area of the globe and often for several weeks or ...
James K's user avatar
  • 126k
5 votes
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Visualized shapes of areas of total and partial solar eclipse

There are purpose-made animations for recent eclipses on the NASA pages: 2021 Annular Solar Eclipse. You can download the video, and with a decent player like vlc, you can thus go back and forth. You ...
planetmaker's user avatar
4 votes

Book recommendation

What about Astronomical Algorithms by Jean Meeus. It's a mathematical discussion of the formulae behind astronomical events such as solar eclipses, occultations and transits. I have read it. It is a ...
Snack_Food_Termite's user avatar
4 votes

Any book on `How do they know it (in Astronomy)`?

You could try The History of Astronomy: A Very Short Introduction by Michael Hoskin. Or, for a more detailed but more expensive textbook, The Cambridge Concise History of Astronomy edited by Michael ...
gandalf61's user avatar
  • 657
4 votes

Perihelion dates and parameters

In googling I stumbled across the following list of Perihelion dates and times back through the beginning of the twentieth century, and forward to then end of the twenty-first. http://cococubed.asu....
notovny's user avatar
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4 votes

Where can I find historic rates of meteor impact events?

The database of the meteoritical society might be what you are looking for. You can do a search by year. Based on this data, I drew this quick plot of number of recorded meteorites per year Now ...
usernumber's user avatar
  • 17.6k
4 votes

Any book on `How do they know it (in Astronomy)`?

If you wanted to focus on one discovery that changed the world, I would suggest "Longitude" by Dava Sobel. It shows how something that could be dry - how navigators discovered what longitude was - is ...
Snack_Food_Termite's user avatar
4 votes
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Data for spectrum of Wolf-Rayet stars

If you know how to reduce raw spectrum data, you may look at the official archives of big observatories (ESO, MAST, CADC). But a quicker and much easier way could be to use the following portal: http:...
onekiloparsec's user avatar
4 votes

What is the best database for identification of spectral lines?

Here is another alternative/supplement to NIST. The VALD atomic line database, which is specifically for astrophysical applications. I believe this database does contain some molecular data too.
ProfRob's user avatar
  • 156k
4 votes
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Resource Recommendations to systematically develop a foundation via Self study in Astrophysics/Astronomy?

High School Senior Your first mission is to concentrate on getting a good set of results from high school. That really means not spending your time chasing astronomy and astrophysics yet. Yes, this ...
StephenG - Help Ukraine's user avatar
4 votes
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Learning astrophysics from zero

If your goal is to learn about this, sure why not? The internet, books, tv you can learn. Turn this around, could an engineering student who, out of the the blue got an interest in literature but had ...
James K's user avatar
  • 126k
4 votes

Books to use for NSEA (first stage of IOAA in India)

I've bagged a gold medal for India in the IOAA-Jr, so I think I may answer your question to some extent. Math and Physics are pretty standard introductory JEE level stuff they ask in NSEA. If you take ...
Aarush Mishra's user avatar
3 votes
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An image for the unified model of AGN

I agree with your supervisor: If your paper is going to a peer-reviewed journal, you should cite peer-reviewed material. I also agree with you that the NASA version is clearer than the original figure,...
pela's user avatar
  • 38.9k
3 votes
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Extragalactic Magnetic Fields - General Information That I'm Missing

On this question, the Widrow (2002) review is still pretty up-to-date. You can also have a look on the introduction of Beck (2013), a recent PhD thesis on the subject with a straightfoward ...
MBR's user avatar
  • 5,523
3 votes

What are the equations governing stellar evolution (Luminosity, Mass, Temperature, Radius)

What you want is hydrodynamic stellar evolution. The following starts with a brief review of hydrostatic case to give the fundamentals. The last paragraph discusses the hydrodynamic case. For ...
Kornpob Bhirombhakdi's user avatar
3 votes

Where to obtain Tycho Brahe's data?

Tycho Brahe's original notebooks are kept in the Royal Library in Copenhagen. A digitized version is available here. I don't speak danish or latin, so I'm not sure if this is the only notebook he had, ...
Benno's user avatar
  • 131
3 votes
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Book recommendation

I used Foundations of Astrophysics by Ryden and Peterson in my first college astronomy course, which focused on stars, the ISM, and galaxies. The textbook itself goes far beyond those topics, delving ...
HDE 226868's user avatar
  • 37.2k
3 votes

"Table of Astronomy's" depiction of the solar system models

A bit more on the Ptolemaic system. The five outer circles, from the inside out: Sphere of Saturn. The spheres are labeled on the inside, so this one corresponds to the Saturn symbol. Sphere of ...
j-g-faustus's user avatar
  • 1,301

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