Sun Path

where light meets land, right now

listening for the sun…

drag to rotate · tap a gold pin to read its alignment

Walk through time

The four turnings drift. Earth's tilt creeps by a fraction of a degree each millennium, so the spot where the solstice sun breaks the horizon slides along it. Pick a monument and walk the years — watch the sun pull away from where its builders aimed. (At the equinox, every one of them agrees: due east, due west, everywhere.)

A calendar of turnings

The four hinges of the year, each marked across cultures by walks, processions, and gatherings.

The sun's figure of eight

Stand at solar noon every day for a year and trace where the sun is. The shape it draws is the analemma — a slow, elegant figure-of-eight written by Earth's tilted, elliptical orbit.

Where dawn comes from

At the equator the sun rises near due east all year. The further from the equator, the wider its swing — until at high latitudes there are months when it never rises at all.

Walk to the sun

Tomorrow vs today

Around the equinoxes, the day grows or shrinks by 2–3 minutes every 24 hours. Around the solstices, almost nothing — solstice is Latin for "the sun stands still."

If you're walking a pilgrimage stage, the Daylight Walk Budget turns this into a usable answer — pick a route, set a pace, see whether today's light holds.

The Moon Path shows where the moon stands at any coord — phase, tide curve, lunar standstill — a companion instrument for night walks and coastal stages.

How this is computed

The sun's position uses the NOAA Solar Calculator (Spencer 1971 truncated series) — declination accurate to about 0.05°, the equation of time to about half a minute. The moon and the deep-time scrubber use Meeus, Astronomical Algorithms (2nd ed.). Ancient solar and lunar alignments are pinned from archaeological literature (Ruggles, Astronomy in Prehistoric Britain and Ireland), not derived from the model. Good for contemplation, not for navigation. The deep-time horizon uses each year's obliquity (valid roughly 3000 BC–3000 AD) for the sunrise/sunset azimuth, against a fixed alignment bearing: Stonehenge's solstitial axis (Lockyer & Penrose 1901; Ruggles 1997) and the great-circle bearing from Ōmori-Katsuyama to Mt. Iwaki's summit, whose winter-solstice sunset is documented by Kaner (World Archaeology 115, 2022) and the UNESCO Jōmon listing. Azimuths assume a flat sea-level horizon and ignore atmospheric refraction (~0.5°) and disc radius, so they mark the geometric event, not the first gleam.