opendata402 Sun Position & Daylight API

Choose this endpoint when you need accurate, algorithmically computed solar times (sunrise, sunset, solar noon) for any global coordinate and date, especially for automation triggers, scheduling, or engineering calculations. It is based on the NOAA solar algorithm (accurate to ~1 minute) and handles edge cases like polar day/night. Prefer it over weather APIs that incidentally include sunrise/sunset but don't guarantee accuracy or polar handling, and over local device APIs when you need server-side computation for arbitrary coordinates.

• Invalid latitude (outside -90..90) or longitude (outside -180..180) returns a validation error
• Malformed date string (not YYYY-MM-DD format) returns a parse error
• Missing required lat or lon parameters returns a 400-level error
• Locations at extreme polar latitudes during solstice periods return polar day/night indicators instead of standard times