Nautical Twilight Schedule
Generate a yearly streetlight operating schedule for any location. Returns daily nautical dusk (lights ON) and nautical dawn (lights OFF) times.
Default location: US Census Mean Center of Population (2020) — Hartville, MO. Streetlights turn ON when the sun drops to −6° elevation (end of civil twilight) and OFF when it rises back to −6° (start of civil twilight).
Phase Calculator
Upload a CSV with coordinates and timestamps. Each record gets tagged with sun elevation, twilight phase, and streetlight status.
1. Upload CSV
Drop a .csv file here or
Maximum 2.5 million rows
2. Map Columns
Confirm which columns contain your location and date/time fields.
3. Processing
Splitting and processing your data...