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aa-js
The most comprehensive collection of accurate astronomical algorithms in JavaScript (TypeScript).
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
What I would like to do, is to dive into this book, try to understand it, adapt the calculations into a Ruby library, and explain on blog posts what I am learning and how things work. I am not the first to adapt these calculations into libraries, you can easily find C++ or JavaScript adaptations. These adaptations will be useful to me when things will be complicated for my simple mind. But my main goal is to understand completely what I will be reading and to provide as much as possible information about the mind process around understanding mathematical algorithms and building code around them.