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Parhélie computes the sun’s exact height (NOAA algorithm, ±0.1°) for any city and finds the precise dates and local times when another city sees the very same sun. 7,774 cities, works offline, built entirely on an iPhone. €0.99, once.
Hi everyone,
Parhélie answers a question I couldn’t stop thinking about: the sun I see today — where and when does another city see it at exactly the same height in the sky?
It computes solar elevation using the NOAA algorithm (≈0.1° accuracy) and finds the precise dates and local times when another city matches it. It also gives the two annual zenith passages for tropical cities, plus solstices and equinoxes recalculated each year.
Two things I’d like to mention up front. First, it’s a PWA — no App Store, no Play Store. You open it in a browser and add it to your home screen; it then works offline. Second, the city database covers 7,774 cities above 80,000 inhabitants, hosted with the app itself, so no third-party calls when you search.
One personal note: everything — design, code, testing, deployment — was done from an iPhone. No computer at any point. I’m a public health physician by training, so this was my first time building the instrument rather than using one.
It’s 0.99 €, one-time. No subscription, no ads, no tracking. I’d love feedback from anyone who wants to challenge the accuracy.
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About Parhélie on Product Hunt
“Find when another city sees your exact same sun ”
Parhélie was submitted on Product Hunt and earned 0 upvotes and 2 comments, placing #146 on the daily leaderboard. Parhélie computes the sun’s exact height (NOAA algorithm, ±0.1°) for any city and finds the precise dates and local times when another city sees the very same sun. 7,774 cities, works offline, built entirely on an iPhone. €0.99, once.
Parhélie was featured in Web App (123.3k followers), Weather (3.3k followers) and Space (8.6k followers) on Product Hunt. Together, these topics include over 38.1k products, making this a competitive space to launch in.
Who hunted Parhélie?
Parhélie was hunted by Samer ABOUKAIS. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Samer ABOUKAIS