The equation of time and the analemma

  • Lynch P
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Abstract

The Earth's progress around the Sun varies through the year. Combined with the tilt of the axis of rotation, this results in variations of the length of a solar day. The variations are encapsulated in the Equation of Time. A plot of altitude versus az-imuth for the Sun at 12 noon local time through the year describes a figure-of-eight curve known as an analemma. By analysis of the observations, we find that the qualitative aspects of the analemma can be reproduced using just two sinusoidal components.

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Lynch, P. (2021). The equation of time and the analemma. Irish Mathematical Society Bulletin, 0069, 47–56. https://doi.org/10.33232/bims.0069.47.56

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