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Summary: The Analemma Dilemma
Solving visualization issues in astronomy using 3D graphics
Hannah Bull
April 15, 2011
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Abstract
This project was undertaken under the supervision of Professor Helmer
Aslaksen and was completed as partial fulfilment of an independent study
module. The report focuses on visualisation problems involved in mod-
elling astronomical phenomena, with particular reference to how the analemma
can be explained and depicted using graphical figures.
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Contents
1 Introduction 4
2 Background for Astronomical Modelling 5
2.1 Visualising the Celestial Sphere . . . . . . . . . . . . . . . . . . . 5
2.2 Depictions of the Sun's Declination . . . . . . . . . . . . . . . . . 8
2.2.1 Equation of Time . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.2 The Analemma as a Depiction of the Equation of Time . 12
3 2D Modelling 13
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