Sun & moon
Longitude from Meeus's series — verified against his worked examples.
Panchang limbs
Tithi, nakshatra, yoga and karana, derived from the elongation.
Sunrise / sunset
The standard sunrise equation, for any latitude and longitude.
Honest precision
Stated to ~0.01–0.05°; timings are approximate, and we say so.
Built to sit under panchang — the app stays thin, the capability lives here.