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Loading contentWhat can you observe tonight? A computed composite of the Sun & Twilight, Moon, and Planet tools for any location and date — the twilight and darkness windows, the Moon and its moonlight impact, and which naked-eye planets are best placed, ranked. It adds no new astronomy and invents no weather, cloud, ISS, aurora, meteor, or comet data. Your location is used only for the calculation and is never stored.
Privacy: your location is used only for this calculation and is not stored. No browser geolocation or IP lookup — coordinates come only from what you type. Leave the date blank for tonight.
Enter a latitude and longitude to compose tonight's observing conditions — the twilight and darkness windows, the Moon, and which planets are best placed. Nothing is shown until you do; no location is assumed.
The dashboard above is a composite of the computed Sun & Twilight, Moon, and Planet tools — it adds no new astronomy, only aggregates and ranks. It does not include weather, cloud cover, seeing, transparency, or light pollution, and it does not show live ISS passes, aurora, meteor showers, or comets. Each underlying tool stands on its own:
Facts on this topic will be cited from these primary and reference sources.
Public-domain solar-position geometry: sunrise, sunset, solar noon, twilight, declination, and the equation of time.
Public domain (US Government work).
Precise time, almanac data, Sun/Moon rise-set, and phases.
Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.