HeyJaredIt's about time
a series of reflections on calendars, clocks, astronomy, astrology, and in general how we engage with the passage of time.
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- Sep 20, 2026
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Structured time. Part 3 (opens the original)
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If you haven’t read the first two parts of this series, it probably makes sense to do that first. The first part describes the Cassini Room of the Paris Observatory and how its architecture relates to the passage of the year. The second part describes different strategies for organising calendars to account for the uneven numbers of days and lunar months in a year. The timeline in the Cassini Room is marked by the Sun’s passage through the zodiac, from winter to summer solstice
Structured time. Part 2 (opens the original)
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Note: This is the second of a three-part series. To read Part 1, follow this link.As part of a week-long summer school on astral science in Paris this June, participants had the opportunity to present group projects on a variety of topics. The idea was that, between Monday and Wednesday we would think about what topic we wanted to work on based on our experience in the sessions of the summer school. Then over lunch on Thursday the organisers of the workshop would assign us to small groups based
Structured time. Part 1 (opens the original)
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In the second week of June, I attended a summer school on the “Global History of Astronomy,” co-hosted by the French National Library and the Paris Observatory. The event brought together scholars from as far away as Chicago and Yogyakarta to learn about the Paris collections of texts and instruments related to celestial observation and to build a collective understanding of how societies across Eurasia have studied the cosmos over time. (Before going on, I want to acknowledge that these collect
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