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History of the Observation of Stars

Andreas Schrimpf

TL;DR

This paper surveys the history of stellar observation from ancient catalogs to modern space-based astrometry, highlighting how increasing precision reshaped our view of stars and the Galaxy. It traces methodological milestones—from naked-eye cataloging and brightness scales to heliometers, meridian circles, photographic plates, and high-throughput spectroscopy—leading to precise three-dimensional maps and stellar archaeology with Gaia. Key milestones include Hipparchus' $850$-star catalog, Ptolemy's $1022$ stars, Bessel's first parallax of $0.3''$ for $61$ Cygni, and the Gaia-era mapping of over $1.8\times 10^{9}$ stars with micro-arcsecond precision, enabling 3D positions and properties across the Milky Way. The paper also discusses current and upcoming surveys—Rubin Observatory, 4MOST, and space telescopes—that will deliver high-cadence photometry and large spectral catalogs to address open questions in stellar birth, evolution, and Galactic structure, and to enable multi-messenger studies of stellar phenomena.

Abstract

There are about 6000 stars, that can be seen with the naked eye and have been observed for centuries for various purposes. More modern investigations using advanced telescopes show that our Milky Way, a quite common galaxy, consists of about 100 -- 400 billion stars. And, it is estimated that there are between 200 billion to 2 trillion galaxies in the observable universe -- all of them consist mostly of stars, and sending observable signals which also represents nothing more than a superposition of the light of individual stars. So we can conclude that the most common observable objects in the Universe are $\textit{stars}$. In this chapter, we focus on the long history of the observation of stars (compared to studies in other fields of science) to find out more about the nature of these objects.

History of the Observation of Stars

TL;DR

This paper surveys the history of stellar observation from ancient catalogs to modern space-based astrometry, highlighting how increasing precision reshaped our view of stars and the Galaxy. It traces methodological milestones—from naked-eye cataloging and brightness scales to heliometers, meridian circles, photographic plates, and high-throughput spectroscopy—leading to precise three-dimensional maps and stellar archaeology with Gaia. Key milestones include Hipparchus' -star catalog, Ptolemy's stars, Bessel's first parallax of for Cygni, and the Gaia-era mapping of over stars with micro-arcsecond precision, enabling 3D positions and properties across the Milky Way. The paper also discusses current and upcoming surveys—Rubin Observatory, 4MOST, and space telescopes—that will deliver high-cadence photometry and large spectral catalogs to address open questions in stellar birth, evolution, and Galactic structure, and to enable multi-messenger studies of stellar phenomena.

Abstract

There are about 6000 stars, that can be seen with the naked eye and have been observed for centuries for various purposes. More modern investigations using advanced telescopes show that our Milky Way, a quite common galaxy, consists of about 100 -- 400 billion stars. And, it is estimated that there are between 200 billion to 2 trillion galaxies in the observable universe -- all of them consist mostly of stars, and sending observable signals which also represents nothing more than a superposition of the light of individual stars. So we can conclude that the most common observable objects in the Universe are . In this chapter, we focus on the long history of the observation of stars (compared to studies in other fields of science) to find out more about the nature of these objects.

Paper Structure

This paper contains 21 sections, 7 figures.

Table of Contents

  1. History of the Observation of Stars
  2. Introduction
  3. Ancient Observations
  4. The first star catalog
  5. The brightness of stars in ancient catalogs
  6. The Beginning of the Modern Era
  7. The catalogs in the following centuries
  8. Magic mechanics improving the accuracy
  9. Beginning of the Telescope Era
  10. Telescopes used for positional astronomy
  11. High precision measurements of stellar positions -- fundamental star catalogs
  12. Further properties of stars emerge
  13. The discovery of the proper motion
  14. The discovery of double stars
  15. The brightness of stars
  16. ...and 6 more sections

Figures (7)

  • Figure 1: Autumn equinox as seen from Rhodes 150 years before Hipparchos (left) and at the time of Hipparchos' observations (right). The ecliptical length of Spica differs by 2.03 degrees. (Figures prepared with Stellarium.)
  • Figure 2: Stars of the constellation Ursa Minor (UMi) from Almagest, page 324. The left column contains a description of the stars, and the data to the right are longitude, latitude, and magnitude (Digitized by Digitale Bibliothek, Münchener DigitalisierungsZentrum).
  • Figure 3: Comparison of the accuracy of star catalogs of the pre--telescope times. Shown are the differences in coordinates from the pre--telescope catalogs and calculated coordinates from the HIPPARCOS catalog. The accuracy of Wilhelm's catalog surpasses that of all other pre--telescope catalogs.
  • Figure 4: Olaf Rømer invented the meridian circle in 1690 and achieved an accuracy of 4 arcsec for stellar positions horrebow1735
  • Figure 5: Relative orbit of the double star system Castor A and B, observations from 1826 to 1889. (Popular Astronomy 4, 1896, p. 286)
  • ...and 2 more figures