Over the course of three months, more than 200 members of this community submitted eye-level horizon readings taken at the same set of local times, using a shared measurement protocol we developed together in the forums.
Participants used simple tools — a tripod-mounted camera, a bubble level, and a printed reference chart — to record where the horizon sat relative to a fixed sightline as the sun moved through the sky. Submissions came from coastal cities, inland plains, and several mountain lookouts.
This article walks through the shared protocol, presents the raw, unedited submission set, and lays out several possible interpretations of the pattern that emerged. We encourage readers to pull the dataset themselves and check our math — that is the whole point of doing this in the open.
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