I am a photographer. I shoot landscapes, street, portraits and macro — and on clear nights I point my Celestron 6SE at the sky from my rooftop. My dark-sky escapes are Yosemite, Joshua Tree and Saratoga, and every one of those trips starts the same way: when is the light right, when is it truly dark, and will the clouds cooperate?
The professional planning tools answer those questions well, but they cost $10.99 or more and keep calculators, lessons and planning in separate paid silos. I wanted one quiet place that plans the shoot, does the field math and teaches the craft — free for everyone, in English and Hindi, working offline when there is no signal at the trailhead.
So I built Roshni. Every calculation runs on your device; nothing you type ever leaves it. It will always be free.