The Event
Chase the Sun is an annual unsupported cycling challenge held on the summer solstice. The goal is simple: ride from sunrise to sunset on the longest day. There is no official route, no timing system, no medals, and no organisational infrastructure. You choose your start point, you plan your route, and you ride until the light is gone.
The absence of external structure is the point. Chase the Sun tests navigation, self-management, and the ability to sustain consistent effort over a full day without checkpoints, support stops, or external validation.
Why This Format Works
For a body managed through Prosthetic Physiology, the lack of imposed structure is an advantage rather than a challenge. External event formats — checkpoints, cut-off times, mandatory rest points — are designed around a population-average physiology. My physiology is not population-average. Managing my own schedule within a defined time window suits the Temporal Prosthesis model: I set the physiological windows, I control the timing, and I adjust based on data rather than event infrastructure.
A body that functions better moving than still is well suited to a format where the objective is simply to keep moving for as long as there is light.
The Solstice
The summer solstice in southern England gives approximately 16 hours 38 minutes between civil sunrise and civil sunset. That is a substantial window for accumulated load. The Lag Factor applies across the full day: decisions made in the first four hours determine what is available in the final two. Chase the Sun is a practical test of the 80% rule applied over a full-day event.
No timing. No medals. No route signs. Sunrise to sunset. A body that functions better moving than still chose the right event.