02 · The sky right now
What the light is doing
Four numbers. Read them once, then look up — not down.
Optimal window
Peak flux
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Recharge score
CRS index
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/100
UV safety
Safe viewing
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Your call
Action
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"Reading your sky — live numbers land here in seconds…"
03 · Daylight curve
The day, at a glance
Circadian score vs. UV · 7:00 AM – 6:00 PM
Light score
UV index
The whole point · put the screen away
Lock it. Step out. Touch grass.
SunSync has done its job the moment you stop reading. Twenty unhurried minutes under the open sky — no sunglasses, no screen, gaze soft on the horizon.
- 01Lock your workstation
- 02Step into daylight
- 03Look far, breathe slow
The timer breathes with you. The tab can wait.
Sentry tracing · pipeline telemetry Total … · expand
ai.telemetry.ingestOpen-Meteo atmosphere
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ai.model.tabpfnTabPFN melanopic regression
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ai.llm.gemmaGemma directive synthesis
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📚 Why 20 minutes of daylight works
Hattar et al. · Science 2002
Melanopsin retinal cells (ipRGCs) synchronize the brain's master clock — screens can't trigger them, daylight can.
Lucas et al. · Trends in Neurosciences 2014
Equivalent Melanopic Lux (EML) peaks near 480 nm — the blue-cyan band abundant outdoors, absent behind glass.
Huberman Lab · Stanford
Morning daylight viewing anchors cortisol and sets a 14–16 h countdown to natural melatonin and deep sleep.