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Ask HN: Most interesting tech you built for just yourself?

1901 points l2silver | 2 comments | 27 Apr 23 15:04 UTC | HN request time: 0.423s | source

Maybe you've created your own AR program for wearables that shows the definition of a word when you highlight it IRL, or you've built a personal calendar app for your family to display on a monitor in the kitchen. Whatever it is, I'd love to hear it.
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jakear ◴[27 Apr 23 16:10 UTC] No.35730261[source]▶
A website to see a map of the world's tides, and bidirectional predictions for individual stations (edit: worldwide too, forgot I added that). The UI/UX is... archaic, but that's just how I wanted it. It works fully offline. https://solunar.pages.dev

Most fun part was transcribing 70+ year old NOAA tide calculation mathematic/astronomic/hydrologic research papers into modern TypeScript. Approach is semi-documented here: https://github.com/JacksonKearl/solunar

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1. itake ◴[28 Apr 23 05:23 UTC] No.35737713[source]▶
that is cool, but I'm curious when the highest tide vs lowest tide of the year is.
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2. jakear ◴[28 Apr 23 13:28 UTC] No.35741046[source]▶
It will change station to station, but if you open the station details page, adjust X Range to something like 28/180 days, then tune low pass to filter out all the high frequency (daily) fluctuations, you might get your answer. Some stations don't have strong Solar contributions, and won't change much on an annual basis, you can enable the Harmonics toggle and see if any show up on the outside in yellow (disable Sun).

I did consider adding a "max finding" mode of some sort, but that's never really been my use case.