Is there any PC or web applications similar to PhotoPills to calculate golden hour and twilight?
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I use SunCalc.
Probably one of the prettier browser based ones out there.
The Photographer's Ephemeris (http://photoephemeris.com/). The desktop version is a web app, and they also have iOS and Android versions. I plan every 'proper' shoot I do with it.
I find the following websites to be useful:
The first is aimed more towards solar panel installation than photography, but gives information about sun angle that the second, more popular site doesn't...