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Hi all

Thanks for all the feedback. It's heartening to know there's an active and involved community out there.

@ Frank Reed, David C, Greg Rudzinski

This reflects my novice status. I've only used NP303. I was aware there are other sight reduction methods; I was unaware they used different inputs/outputs. I'll change the title to 'SightReduction - NP303' to highlight the constraint. I may add other forms if/when I get hold of other tables.

@ Dave Walden

Yes, I believe the azimuth us toward the body's GP. If you forward your inputs (the green fields) I'll double-check.

@ Frank Reed

The app is built with the JavaScript framework Vue (https://vuejs.org/). The user interface is Bulma (https://bulma.io/), similar to Bootstrap. The library is astronomia (https://www.npmjs.com/package/astronomia), a JavaScript implementation of Jean Meeus' Astronomical Algorithms; this also provides solutions for parallax and refraction.

Total download size is in the region of 11MB. The app is implemented as a PWA (https://developer.mozilla.org/en-US/docs/Web/Progressive_web_apps); this allows network independence, installation to the home screen, and self-installing updates. I'm not sure there's any way to confirm complete download other than to try the app offline.

If there's any interest, I'm happy to open-source the code.

Chris