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Table of Contents

INTRODUCTION TO APPLIED AND COMPUTATIONAL HISTORICAL ASTRONOMY

1 Introduction to Applied and Computational Historical Astronomy

Susanne M. Hoffmann (Jena) & Gudrun Wolfschmidt (Hamburg)

1.1 Introduction to Computational History of Astronomy

1.1.1 Digitial History

1.1.2 Computational History of Astronomy

1.2 Introduction to Applied Historical Astronomy

1.2.1 Usage of historical data

1.2.2 The aspect of application

1.2.3 Exploring stellar evolution: The needs of astrophysics

1.2.3.1 New stars – an historical example

1.2.3.2 Current research on novae

1.2.4 Successful stories

1.2.4.1 Supernovae

1.2.4.2 Novae

1.3 Opening of the conference contributions

1.4 Bibliography

TECHNICAL ASPECTS

2 Exploring Skies Remote in Time and Culture with Stellarium Georg Zotti (Vienna, Austria)

2.1 Introduction

2.2 Virtual Archaeoastronomy

2.2.1 Why simulation is necessary

2.3 Stellarium

2.3.1 Stellarium for Virtual Archaeoastronomy

2.3.2 Skycultures

2.3.3 Calendars

2.3.4 Simulation of transient phenomena

2.3.5 Interfacing with other programs

2.4 Conclusion

2.5 Bibliography

3 Modeling the Cosmos – Developing a Digital Research Environment for the Computational History of Ancient Astronomy

Ido Yavetz & Luca Beisel (Tel Aviv, Israel)

3.1 Background: Ancient Astronomy and the Question of Visualization

3.2 Project Description

3.2.1 Overview

3.2.2 Technology

3.2.3 Stage of Development

3.2.4 Functionality

3.2.5 User Interface

3.2.6 The virtual planetarium as a tool for study and teaching

3.2.7 The virtual planetarium as a tool for original research

3.2.8 Additional Screenshots

3.3 Bibliography

4 (Semi-)Manual Data-Mining and -Processing

Karsten Markus-Schnabel (Berlin)

GEOMETRY AND ARCHITECTURE

5 Alignment of the Temples of Musawwarat es Sufra

as exemplification for astronomical orientation of Kushite cult architecture Tim Karberg (Münster)

5.1 Introduction

5.2 Alignment of the temples of the Great Enclosure of Musawwarat es Sufra

5.3 Alignment of the Apedemak (“Lion”) Temple of Musawwarat es Sufra

5.4 Religious interpretation of the alignments of the temples of Musawwarat es Sufra

5.5 References

Kepler’s ASTRONOMIA NOVA – COMPUTATIONALLY

6 Kepler’s Astronomia Nova – A Challenge for Computational History and the Philosophy of Science Gerd Graßhoff & Mohammad Yeghaneh Abkenar (Berlin)

6.1 Kepler’s research programme

6.2 Observations and data

6.2.1 Empirical derivation

6.2.2 Brahe’s observations

6.3 Computational Astronomia Nova

6.3.1 A pipeline for text analysis

6.3.2 Computational notebooks

6.3.2.1 Loading natural language processing models

6.3.2.2 Importing Kepler’s text corpus

6.3.2.3 Data frame of observational paragraphs

6.3.3 Reconstruction of the Argument

6.4 Summary

6.5 Bibliography

HISTORICAL STAR CATALOGUES

7 Pre-telescopic star catalogues – Accuracy in magnitudes and positions

Philipp Protte (Jena) & Susanne M. Hoffmann (Jena)

7.1 Introduction

7.1.1 Dependencies and open questions

7.1.2 Previous works on historical magnitudes

7.2 On the original catalogues

7.3 Analysis of the magnitudes

7.3.1 Conversion of the magnitude scales

7.3.2 Analysis of the magnitude errors

7.3.2.1 Variance and covariance

7.3.2.2 Dependence on the colour index

7.3.2.3 Extinction features

7.3.2.4 Star maps and background brightness

7.4 Conclusions from the magnitude analysis

7.4.1 Statistical significance

7.4.2 Final Remarks on the accuracy of pre-telescopic magnitudes

7.5 Appendix: Optical Illusion for regression

7.6 Modern attempts of magnitude estimation

7.6.1 Neutral density filters

7.6.2 A Citizen Science App

7.7 Reconstruction of Ptolemy’s Armillary sphere

7.8 Bibliography

8 Measurements of stellar magnitudes in Ptolemy’s Almagest Gerd Graßhoff (Berlin)

8.1 Bibliography

9 How visible are celestial objects?

Victor Reijs (Lochem, The Netherlands)

9.1 Introduction

9.2 Definitions used to define the visibility of celestial objects

9.2.1 Some angle definitions

9.2.2 Visibility during full darkness

9.2.3 Heliacal events

9.2.3.1 Stars and outer planets

9.2.3.1.1 Star types

9.2.3.2 Inner planets

9.2.3.3 The Moon

9.2.3.4 A summary of apparent heliacal events

9.3 Visibility models

9.3.1 Different types of visibility models

9.3.1.1 Observational models

9.3.1.2 Mathematical models

9.3.1.3 Combined models

9.3.2 Schaefer’s model

9.3.2.1 Parameters in Schaefer’s model

9.3.2.2 Sensitivity analysis using Schaefer’s model

9.3.3 Sensitivity of observational models

9.4 Comparing with observations and other models

9.4.1 Schaefer’s combined model and Kolev’s observations

9.4.2 Schaefer’s combined model and Schoch’s observational model

9.4.3 Schaefer’s and de Jong’s combined model

9.5 Analysing more visibility aspects using a combined model

9.5.1 Day and night vision

9.5.2 Star type determination

9.5.3 Visibility of First Crescent

9.5.4 Visibility of Venus during a year

9.5.5 Date distribution of Venus’ heliacal rise

9.5.6 Are observations actual observations?

9.6 Concluding remarks

9.7 Bibliography

10 The Star Catalogue of Wilhelm IV, Landgraf von Hessen-Kassel

Andreas Schrimpf (Marburg) & Frank Verbunt (Nijmegen, The Netherlands)

10.1 Introduction

10.2 Astronomy at Kassel

10.3 The Star Catalogue of Wilhelm IV

10.4 Accuracy of the Measurements

10.5 Accuracy of the Computations

10.6 Accuracy of the Star Catalogue

10.7 Conclusions and Outlook

10.8 Appendix

10.9 Bibliography

INDIVIDUAL STARS

11 Studies of Historical Solar Observations: Recent Advances and Future Prospects

José M. Vaquero (Mérida, Badajoz, Spain)

11.1 Introduction

11.2 Sunspot counting and solar activity

11.3 Sunspot distribution and characteristics

11.4 The Maunder Minimum

11.5 Some final comments

11.6 Bibliography

12 What can photographic plate archives contribute to modern astrophysics?

Rene Hudec (Prague, Czech Republic)

12.1 Introduction

12.2 Astronomical plates as cultural heritage

12.3 The non-astronomical photographic collections

12.4 Photographic plate scanning methods

12.4.1 Transportable digitizing device

12.4.2 The inventory of astronomical plate collections

12.4.3 Selected plate and/or negative collections

12.5 The value of astronomical photographic archives for modern astrophysics

12.5.1 Variable Stars

12.6 Conclusions

12.7 References

13 Mira, Eta Carinae and Algol – Variable Stars as Milestones in the History of Astronomy and Astrophysics

Björn Kunzmann (Hamburg)

14 Discovery of an emission nebula in the Galactic globular cluster M 22

Fabian Göttgens (Göttingen), Peter M. Weilbacher (Potsdam), Martin M. Roth (Potsdam), Stefan Dreizler (Göttingen) et al.

15 Review on the search for historical novae and several byproducts

Susanne M. Hoffmann (Jena) & Nikolaus Vogt (Valparaíso, Chile)

15.1 Long-term studies in astrophysics

15.2 Suggestions of historical novae and supernovae

15.2.1 Supernovae

15.2.2 Several questions occurring

15.2.3 Novae

15.3 How many novae do we expect?

15.4 How can we judge the likelihood that a record matches a particular star?

15.5 A new computational method

15.5.1 Test data

15.5.2 Expected Results and Uncertainties

15.5.3 Yearly change in the dataset

15.6 Results from applying our method

15.6.1 Successful findings

15.6.2 Are there possibly recurrent novae on the timescale of centuries?

15.6.3 Does Shara’s CV+shell pair in Sco really match the event 1437?

15.6.4 There are novae candidates among the three suggested supernovae in the 4th century!

15.6.5 The event 483 CE east of Shen

15.6.6 The single event in Niandao: 1404 or 1408

15.6.7 The single event 1181 in Huagai, LM Kui

15.6.8 Doubtful records analysed

15.6.8.1 Three potential novae after comet 837 CE

15.6.8.1.1 Event 837(c)

15.6.8.1.2 Event 837(b)

15.6.8.1.3 Event 837(a)

15.6.8.1.4 Results on 837 CE

15.6.8.2 Eratosthenes’ additional star

15.6.8.3 The record from 396 CE

15.6.8.4 The record from 437 CE

15.6.8.5 The records from 667 and 668 CE

15.6.8.6 The record from 891 CE

15.6.8.7 The records from 1592 CE

15.6.9 Open questions

15.6.9.1 The single event – 76 in Zigong

15.6.9.2 The single event – 46 east of Juanshe, LM Mao

15.6.9.3 The single event +107 in Hu, LM Dongjing

15.6.9.4 The event 1073 or ’74 south of Dongbi

15.6.9.5 The single event 1113 in Yingshi

15.7 Summary

15.7.1 An addition to the historical catalogue

15.7.2 News for the interpretation of text

15.7.3 News for astrophysics

15.8 Bibliography

16 Frequently Asked Questions on our Method

Susanne M. Hoffmann (Jena)

16.1 Can we exclude comets by selection criteria?

16.2 Why do we consider ‘fuzzy stars’ and ‘broom stars’?

16.3 Why we neglect terminology

16.3.1 The noun

16.3.2 The verb

16.3.3 Two examples of misleading text

16.3.4 Conclusion on terminology

16.4 On which identification can we rely for the search fields?

16.5 What counterparts do we search for novae?

16.6 Why do we not consider the distances?

16.7 What types of objects do we search for the thesis and antithesis?

16.8 Why is the resulting table of targets not the solution?

16.8.1 Uncertainty 1: Position and Computing

16.8.2 Uncertainty 2: Corrupted text

16.8.3 Uncertainty 3: Further possibilities for counterparts

16.8.4 Why the research should go on: Uncertainty principle

16.9 What are the error bars of the position?

16.10 What is the outcome of all this?

16.11 Why the Star of Bethlehem is irrelevant here

16.12 Why ‘red Sirius’ is irrelevant here

16.13 Seven(?) Pleiades

16.14 What were the filter criteria for modern counterparts?

16.15 Bibliography

Authors

Nuncius Hamburgensis

Index

Applied and Computational Historical Astronomy. Angewandte und computergestützte historische Astronomie.

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