Winona Lake, 2025

Explorable · Cloud × Elevation

Same place, different sun, different sky.

Each clip is one frame per day at a chosen sun elevation, filtered to days under a chosen cloud-cover threshold. Drag the sliders. Notice how the year fills in or thins out as you tighten the clouds.

method: filter_weather.py --max ${cloud$} → fixed_clock.py --elevation ${deg$}

Cloud cover ≤ 0%

0%5%10%20%40%60%80%100%

Sun elevation 0°

−45°−30°−15°0°15°30°45°

Solar Locked

Stop the sun. Watch the seasons.

The sun returns to the same point in the sky on different days at different times. Pick those moments and you get a video where the world ages while the light holds still.

method: solar_locked.py finds frames matching az/el within 1° tolerance, one per valid day.

Spring & fall noon az 180° · el 30° sun pinned due south, mid-arc

Low winter sun az 180° · el 25° as low as the noon sun ever gets here

Summer zenith az 180° · el 60° only the warmest months reach it

East at dawn az 90° · el 15° sunrise locked in place

West at dusk az 270° · el 15° sunset locked in place

Late afternoon az 220° · el 25° long shadows, golden bias

Ghostless · Temporal Median

A year with the weather removed.

For each pixel, take the median across a sliding window of days. Anything that moved — clouds, rain, a passing bird, branches in the wind — gets statistically erased. What's left is a still landscape, slowly aging through the seasons.

method: cloud_removal.py with a 14-day rolling window, 1-day step.

temporal median · 14-day window · year

Sun Paths

The arc of one day, painted on one frame.

Every 15 minutes through a single day, lighten-blended into one image. The sun draws its own arc. Stand the four key dates side by side and the year's tilt is visible at a glance.

method: time_stack.py --interval 15 on solstices and equinoxes.

Winter Solstice sun path — **Winter Solstice** 2025-12-21

Spring Equinox sun path — **Spring Equinox** 2025-03-20

Summer Solstice sun path — **Summer Solstice** 2025-06-21

Fall Equinox sun path — **Fall Equinox** 2025-09-22

Star Trails

Hours of stars in a single still.

On clear nights, every frame from dusk to dawn is blended with a "lighten" mode — only the brightest pixel at each location survives. Stars become arcs, planes become dashes, the moon becomes a streak.

method: time_stack.py with lighten blend, full night, only on nights with <10% cloud cover.

Keograms

A whole month in one strip.

A vertical column of pixels from the same place in every frame, stacked horizontally. Time becomes the x-axis: morning on the left, evening on the right; for monthly keograms, day-by-day across the strip.

method: keogram_day.py — single date or date-range mode.