Earthshine Rhythms

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  Earthshine Rhythms App Icon

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  Earthshine: sun, moon and sky for the exact spot you are standing on.

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  Sunrise, sunset, golden hour and blue hour to the minute, for your coordinates, not your city.

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  Stargazing score, planets above you, and ISS passes predicted from real orbital data.

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  Where you are in the season, plus air quality and space weather.

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  What is in season near you. One unlock, you pick the price, powered by RevenueCat.

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  Screenshot of app without device frame

Inspiration

Weather apps tell you the forecast for your city. We wanted an almanac for the exact spot you are standing on: when the light turns gold, what the moon is doing tonight, and whether the sky is worth going outside for.

What it does

• Solar: sunrise, solar noon, sunset, golden hour and blue hour to the minute, for your coordinates, not your city. How much daylight you have and what comes next.
• Lunar: tonight's moon phase, how lit it is, and the next full and new moon.
• Earth: where you are in the season, air quality nearby.
• Sky: a stargazing score from live cloud cover and moonlight, which planets are up, ISS passes predicted from its real orbital elements (Celestrak), and space weather.
• Food: what is in season near you.
• Sky Alerts: a quiet heads-up before a full moon, a new moon, a solstice or golden hour.

The sun, moon and planet maths runs on the phone. No account, no tracking, and it keeps working with no signal.

How it makes money

• No subscription, no ads. Everything unlocks with one payment, and you pick the price: three non-consumables ($2.99, $5.99, $9.99) on one complete entitlement.
• The purchase sheet is built from the ladder RevenueCat offering; purchase, restore and entitlement checks run through the RevenueCat SDK.
• Pay-what-you-want is treated as a price ladder, not a tip jar: every tier gets the same features, so the choice measures what people think the app is worth.

How we built it

Capacitor 8, Vue 3 and TypeScript with the RevenueCat Capacitor SDK. Solar position, lunar phase, planet positions and twilight angles are computed on device; weather, space weather and ISS orbital elements are fetched only when online.

Challenges

ISS passes are only worth showing when they are real: the station has to be sunlit while your sky is dark. Getting that right from raw orbital elements, on the phone, was the hardest part.

What's next

A golden hour widget, Android, and a web version with RevenueCat Web Billing.

Built With

• capacitor
• celestrak
• ios
• open-meteo
• revenuecat
• typescript
• vue