Sol Tychonis

A Case Study in Bayesian Data Analysis


This analysis examines a set of 1,432 solar transit altitudes made by Tycho Brahe and his assistants over the years 1588-1595 (Julian). The goal is to assess the accuracy of Tycho's primary instruments and to determine whether they were equally accurate. Similar analyses have been done before but without the benefit of state-of-the-art Bayesian methodology which is described herein in some detail.

This article is a PDF file (23 pages) available at the following link:

Sol Tychonis

The Supplementary Material associated with this case study includes the data file, source code for processing the latter along with the processing output plus all files needed to carry out a Bayesian analysis using MacMCMC. Not included, but required, is a free C++ library of astronomical algorithms, AA+. This Supplementary Material is downloadable (43 Kb, zipped) from here.


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This page last updated on 1 December 2021.