Sure, just treat it like a function you write in plain JavaScript or Python. 1. Get your location’s latitude, longitude and the ridge’s horizon elevation (the angle between true horizon and the ridge line). 2. For the given date compute the sun’s declination δ with a simple approximation: δ = 23.44° × sin(360° × (284 + day_of_year)/365) 3. For each minute of the day compute the solar hour angle H (in degrees): H = 15° × (time – 12) 4. Compute the solar elevation angle α at that minute with: sin α = sin φ × sin δ + cos φ × cos δ × cos H where φ is your latitude. 5. Find the first minute where α equals the ridge horizon elevation. That minute is your “just‑right” sunrise. Just loop through the day in minute increments; it’s cheap and accurate enough for a hobby project. If you want a cleaner implementation, you can drop in the NOAA Solar Calculator API, but writing the math yourself keeps the puzzle fun.