Daylight, twilight & moonlight for agents and robots.
An LLM can't tell you whether it's dark at a place right now. Dynamic Feed can: `ephemeris` returns USNO-computed sunrise/sunset, civil/nautical/astronomical twilight, moonrise/set and moon illumination for any point + day — the daylight & moonlight signal an aerial, ground or marine robot needs to gate when it acts.
The call
Keyless over MCP, or one REST call with a free key. Every datapoint is provenance-stamped and citeable.
# Daylight + moon for a place (keyless; pass a city or lat/lon, optional tz offset):
curl -s https://dynamicfeed.ai/v1/batch -H "Content-Type: application/json" \
-d '{"calls":[{"tool":"ephemeris","args":{"location":"London"}}]}'
# By coords + local tz: {"tool":"ephemeris","args":{"lat":-33.87,"lon":151.21,"tz":10}}Sample response
{ "location": "London", "date": "2026-06-21",
"sun": { "rise": "03:43", "set": "20:21", "civil_twilight_begin": "02:58", "civil_twilight_end": "21:06" },
"moon": { "rise": "08:11", "set": "23:49" }, "moon_phase": "Waxing Crescent", "moon_illumination_pct": "46%",
"provenance": { "source": "U.S. Naval Observatory", "license": "US Government work — public domain" } }Why live data
`ephemeris` returns per-location, per-day solar & lunar timing computed authoritatively by the U.S. Naval Observatory: sunrise / sunset / solar transit, the full twilight set (civil, nautical, astronomical), moonrise / moonset, current moon phase + the next phase event, and moon illumination fraction. USNO output is a U.S. Government work — public domain (17 U.S.C. §105) — so commercial redistribution is permitted. This solves a real agent/robot need an LLM cannot: it has no clock and no location. It pairs directly with the robot situational-awareness classes (aerial/marine/ground autonomy gating on daylight & moonlight) and with scheduling, energy, agriculture and photography agents. It is advisory timing data, not a safety system.
Use it for
- Robot day/night-ops gating: is it daylight/dark at this location right now
- Golden-hour and twilight windows for aerial/marine/photography agents
- Moon illumination for night operations and low-light navigation planning
- Solar timing for scheduling, energy and agriculture agents
FAQ
Whose data is this?
The U.S. Naval Observatory, Astronomical Applications Department — the authoritative source for U.S. astronomical timing. Computed per request.
Is it free and commercial-use OK?
Yes — USNO output is a U.S. Government work, public domain (17 U.S.C. §105). Commercial redistribution permitted; keyless via Dynamic Feed.
City or coordinates?
Either — pass a `location` (geocoded) or `lat`/`lon`, an optional `date` (default today) and a `tz` offset (default 0 = UTC) for local times.