I don’t provide times for nautical or astronomical twilight, because they’re usually not relevant to terrestrial photography—at the end of evening civil twilight, it’s mighty dark. There are perhaps a few exceptions, such as very thin crescent moons and astrophotography, but I tried to show what’s needed most of the time while minimizing the clutter.
I’ve had many—mainly individual—requests for all manner of things; had they all been incorporated, it would be almost impossible to find the stuff that most people want. And the results wouldn’t fit on the page. Showing all twilight times is certainly one of the more reasonable requests. These times are easy to calculate, and I suppose it wouldn’t be that difficult to control using yet another user preference, but there already so many of those that I’ve gotten a few complaints ... In any event, it’s not currently high on the list. I’ve put most of the effort into the search features, because quite honestly, applications that just give Sun and Moon times are a dime a dozen. I do agree that with many sites (such as the USNO), you need to make a handful of calls to get all the data you need. I’ve never tried to do this with the USNO using GETs, so I can’t offer much comment.
For what you’re trying to do, TPE obviously isn’t the solution. And at least for now, the Web app is far behind the iOS app in capability. I also agree that sunrisesunset.com probably isn’t the ideal solution. Have you tried the API for timeanddate.com? Of course, I don’t know what they hit you for once the trial period expires.
It’s interesting that you’re calculating sky luminance, which can be a big issue when trying to catch the Moon without resorting to a composite exposure. I’ve long tried to do it using the CIE method (ISO 15469) but have had trouble finding a way to calculate zenith luminance at solar altitudes less than zero. How do you handle this?
Anyway, let me see what I can do.
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