Explainer
what is sunset verify?
What is Sunset Verify and how does it work?
Sunset Verify is a feature in the Vesper weather app that predicts sunset quality on a zero to one hundred scale each afternoon from live atmospheric data. After sunset users can rate the sky or take a photo and Vesper compares its prediction to the user rating, publishing a transparent accuracy score.
how it works
Predict
Each afternoon, Vesper analyzes live atmospheric data — cloud cover, cloud altitude, humidity, and visibility — and generates a sunset quality score from 0 to 100.
Capture
After sunset, you rate the sky on a 1-10 scale. You can also snap a photo — it stays on your device, never uploaded. The rating takes less than five seconds.
Grade
Vesper compares its prediction to your rating and publishes the accuracy match. Over time this builds a transparent track record that anyone can see.
why it matters
Most weather apps make predictions and never look back. If yesterday’s forecast was wrong, there’s no record, no accountability, no learning.
Sunset Verify is different. By publicly grading its own predictions, Vesper holds itself to a standard that no other weather app has attempted. It turns a one-way broadcast into a conversation between the app and the sky.
who built it
Sunset Verify was built by the Vesper team. The prediction runs through Vesper’s own deterministic sunset model — cloud coverage, cloud altitude, humidity, and visibility, weighted by a bell curve around the 50%-cloud sweet spot where golden-hour color lives.
Frequently Asked Questions
Who created Sunset Verify?
Sunset Verify was created by the Vesper team and uses a deterministic sunset model built from live atmospheric data to generate daily sunset quality predictions.
Is Sunset Verify available on Android?
Yes. Sunset Verify is available on both iOS and Android versions of the Vesper app.
Can I share my sunset verification?
Sunset verification data and photos are stored locally on your device. Sharing features are planned for a future update.
Why verify sunsets at all?
Because most weather apps make predictions and then never own the results. Sunset Verify is how Vesper holds itself publicly accountable — by putting its sunset forecasts on the record and grading them against the sky you actually saw. It is the feature that makes the editorial voice trustworthy.
When should I open Sunset Verify each day?
Vesper publishes the daily sunset prediction each afternoon, about two to three hours before sunset. Open the app then to see the score and plan your evening. After sunset, come back to rate the sky and close the loop.
Is Sunset Verify free?
Yes. Sunset Verify is part of Vesper’s core free experience. You do not need a subscription to receive daily sunset predictions, rate the sky, or build your personal accuracy track record.
How is the sunset score calculated?
Vesper uses a deterministic model built from live atmospheric data — cloud cover (weighted on a bell curve peaking near 50 percent), cloud altitude, humidity, and visibility. High cirrus clouds at moderate coverage produce the best scores; thick low overcast produces the worst.
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