Astronomy: sun, moon, planet, eclipse, twilight and star position calculations.
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https://www.cyclecalcs.com/mcp11 tools · 385msastro_sky_todayOne-call snapshot of the whole sky for a place and moment: moon phase and illumination, which planets are up and worth looking at, the next eclipse, and (with a location) sun times. Reach for this first when the question is broad, like "what is in the sky tonight". For solar-day detail use astro_su…One-call snapshot of the whole sky for a place and moment: moon phase and illumination, which planets are up and worth looking at, the next eclipse, and (with a location) sun times. Reach for this first when the question is broad, like "what is in the sky tonight". For solar-day detail use astro_su…
| Parameter | Type | Description |
|---|---|---|
| date | string | ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only; outside that range the API re… |
| lat | number | Latitude in decimal degrees, north positive. Send lat and lon together. |
| lon | number | Longitude in decimal degrees, east positive (Lisbon is about -9.14). Send lat and lon together. |
| place | string | Place name instead of lat/lon, as "City" or "City,CC" with an ISO country code, e.g. "Lisbon,PT". Resolved server-side; the response then carries a required Ge… |
| tz | string | IANA timezone like "Europe/Lisbon" to render event times in local time. Optional; a resolved place supplies its own timezone. |
astro_sunThe complete solar day for one location: sunrise, sunset, solar noon, day length, civil, nautical and astronomical twilight boundaries, and explicit polar day/night status at high latitudes. Location required. For a series, send start and end (step is whole days, e.g. "1d" or "7d"). For "is it dark…The complete solar day for one location: sunrise, sunset, solar noon, day length, civil, nautical and astronomical twilight boundaries, and explicit polar day/night status at high latitudes. Location required. For a series, send start and end (step is whole days, e.g. "1d" or "7d"). For "is it dark…
| Parameter | Type | Description |
|---|---|---|
| date | string | Single day to report, ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only; outside… |
| start | string | First day of a range (use with end instead of date). ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Y… |
| end | string | Last day of a range. ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only; outside… |
| step | string | Range stride in whole days, e.g. "1d", "7d", "30d". Default "1d". |
| cursor | string | Opaque pagination cursor from a previous result's next_cursor. Send it with the same start/end arguments as the first page. |
| lat | number | Latitude in decimal degrees, north positive. Send lat and lon together. |
| lon | number | Longitude in decimal degrees, east positive (Lisbon is about -9.14). Send lat and lon together. |
| place | string | Place name instead of lat/lon, as "City" or "City,CC" with an ISO country code, e.g. "Lisbon,PT". Resolved server-side; the response then carries a required Ge… |
| tz | string | IANA timezone like "Europe/Lisbon" to render event times in local time. Optional; a resolved place supplies its own timezone. |
astro_moonThe Moon at an instant or as a daily series: phase name and angle, illuminated fraction, distance, apparent size, libration, bright limb, and the next quarter phases. A location adds rise/set and altitude. For a calendar of new and full moons use astro_moon_phases; for the Moon's exact coordinates…The Moon at an instant or as a daily series: phase name and angle, illuminated fraction, distance, apparent size, libration, bright limb, and the next quarter phases. A location adds rise/set and altitude. For a calendar of new and full moons use astro_moon_phases; for the Moon's exact coordinates…
| Parameter | Type | Description |
|---|---|---|
| date | string | ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only; outside that range the API re… |
| start | string | First day of a daily series. ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only;… |
| end | string | Last day of a daily series. ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only; o… |
| count | integer | Number of daily rows from start (alternative to end). |
| cursor | string | Opaque pagination cursor from a previous result's next_cursor. Send it with the same start/end arguments as the first page. |
| lat | number | Latitude in decimal degrees, north positive. Send lat and lon together. |
| lon | number | Longitude in decimal degrees, east positive (Lisbon is about -9.14). Send lat and lon together. |
| place | string | Place name instead of lat/lon, as "City" or "City,CC" with an ISO country code, e.g. "Lisbon,PT". Resolved server-side; the response then carries a required Ge… |
| tz | string | IANA timezone like "Europe/Lisbon" to render event times in local time. Optional; a resolved place supplies its own timezone. |
astro_moon_phasesEvery new moon, quarter and full moon in a window (or the next few from a date): each with its exact instant, distance, apparent size, supermoon classification under both competing definitions, traditional full-moon name, and any eclipse falling on it. Use for "when is the next full moon" and phase…Every new moon, quarter and full moon in a window (or the next few from a date): each with its exact instant, distance, apparent size, supermoon classification under both competing definitions, traditional full-moon name, and any eclipse falling on it. Use for "when is the next full moon" and phase…
| Parameter | Type | Description |
|---|---|---|
| date | string | Anchor date; the next phases follow it. ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to… |
| start | string | First day of a window (use with end). ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 22… |
| end | string | Last day of a window. ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only; outside… |
| count | integer | How many phase events to return from the anchor date. |
| phases | array | Optional filter of phase kinds. Omit for all four. Example: ["full_moon"] for full moons only. |
| cursor | string | Opaque pagination cursor from a previous result's next_cursor. Send it with the same start/end arguments as the first page. |
| lat | number | Latitude in decimal degrees, north positive. Send lat and lon together. |
| lon | number | Longitude in decimal degrees, east positive (Lisbon is about -9.14). Send lat and lon together. |
| place | string | Place name instead of lat/lon, as "City" or "City,CC" with an ISO country code, e.g. "Lisbon,PT". Resolved server-side; the response then carries a required Ge… |
| tz | string | IANA timezone like "Europe/Lisbon" to render event times in local time. Optional; a resolved place supplies its own timezone. |
astro_positionsExact positions for up to 20 bodies at an instant or over a time grid: right ascension and declination in both J2000 and of-date frames, ecliptic longitude and latitude, distance, and, with a location, altitude and azimuth with refraction stated per field. Use for "where exactly is X". Do not pass…Exact positions for up to 20 bodies at an instant or over a time grid: right ascension and declination in both J2000 and of-date frames, ecliptic longitude and latitude, distance, and, with a location, altitude and azimuth with refraction stated per field. Use for "where exactly is X". Do not pass…
| Parameter | Type | Description |
|---|---|---|
| bodies* | array | Bodies to report. Each entry: One of sun, moon, mercury, venus, mars, jupiter, saturn, uranus, neptune, pluto, or a fixed J2000 target as "radec:RA,DEC" with R… |
| date | string | ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only; outside that range the API re… |
| start | string | Grid start (use with end and step). ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200… |
| end | string | Grid end. ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only; outside that range… |
| step | string | Grid stride, e.g. "1h", "10min", "1d". |
| cursor | string | Opaque pagination cursor from a previous result's next_cursor. Send it with the same start/end arguments as the first page. |
| lat | number | Latitude in decimal degrees, north positive. Send lat and lon together. |
| lon | number | Longitude in decimal degrees, east positive (Lisbon is about -9.14). Send lat and lon together. |
| place | string | Place name instead of lat/lon, as "City" or "City,CC" with an ISO country code, e.g. "Lisbon,PT". Resolved server-side; the response then carries a required Ge… |
| tz | string | IANA timezone like "Europe/Lisbon" to render event times in local time. Optional; a resolved place supplies its own timezone. |
astro_rise_setRise, upper transit, set and lower transit for one body at one location, with an explicit status at extreme latitudes (circumpolar, never rises) instead of missing values. Accepts fixed radec targets. For the Sun specifically, astro_sun returns richer twilight structure; for positions between event…Rise, upper transit, set and lower transit for one body at one location, with an explicit status at extreme latitudes (circumpolar, never rises) instead of missing values. Accepts fixed radec targets. For the Sun specifically, astro_sun returns richer twilight structure; for positions between event…
| Parameter | Type | Description |
|---|---|---|
| body* | string | One of sun, moon, mercury, venus, mars, jupiter, saturn, uranus, neptune, pluto, or a fixed J2000 target as "radec:RA,DEC" with RA in hours (0-24) and DEC in d… |
| date | string | ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only; outside that range the API re… |
| start | string | First day of a daily series. ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only;… |
| end | string | Last day of a daily series. ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only; o… |
| search_horizon_days | integer | How many days ahead to search when an event does not occur on the requested day (high latitudes). |
| cursor | string | Opaque pagination cursor from a previous result's next_cursor. Send it with the same start/end arguments as the first page. |
| lat | number | Latitude in decimal degrees, north positive. Send lat and lon together. |
| lon | number | Longitude in decimal degrees, east positive (Lisbon is about -9.14). Send lat and lon together. |
| place | string | Place name instead of lat/lon, as "City" or "City,CC" with an ISO country code, e.g. "Lisbon,PT". Resolved server-side; the response then carries a required Ge… |
| tz | string | IANA timezone like "Europe/Lisbon" to render event times in local time. Optional; a resolved place supplies its own timezone. |
astro_eclipsesSolar and lunar eclipses: the next or previous from a date, or all in a range, with type, magnitude, obscuration, Saros series and global geometry. With a location it adds local circumstances, contact times, and an explicit visible-from-here answer; set visible_only to true to keep only eclipses vi…Solar and lunar eclipses: the next or previous from a date, or all in a range, with type, magnitude, obscuration, Saros series and global geometry. With a location it adds local circumstances, contact times, and an explicit visible-from-here answer; set visible_only to true to keep only eclipses vi…
| Parameter | Type | Description |
|---|---|---|
| direction | string | Search direction from the anchor date. Default "next". |
| type | string | Which kind of eclipse to report. Default "both". |
| count | integer | How many eclipses PER TYPE to return. |
| date | string | Anchor date to search from. ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only; o… |
| start | string | First day of an explicit window (use with end). ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years… |
| end | string | Last day of an explicit window. ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 onl… |
| visible_only | boolean | true keeps only eclipses visible from the supplied location (requires a location). |
| cursor | string | Opaque pagination cursor from a previous result's next_cursor. Send it with the same start/end arguments as the first page. |
| lat | number | Latitude in decimal degrees, north positive. Send lat and lon together. |
| lon | number | Longitude in decimal degrees, east positive (Lisbon is about -9.14). Send lat and lon together. |
| place | string | Place name instead of lat/lon, as "City" or "City,CC" with an ISO country code, e.g. "Lisbon,PT". Resolved server-side; the response then carries a required Ge… |
| tz | string | IANA timezone like "Europe/Lisbon" to render event times in local time. Optional; a resolved place supplies its own timezone. |
astro_dark_windowThe genuinely dark, moonless observing window for a night: astronomical night intersected with the Moon being down, ranked across up to 62 nights with a trend. The right tool for "when should I stargaze / photograph the Milky Way / observe deep-sky objects". Location required. For plain twilight ti…The genuinely dark, moonless observing window for a night: astronomical night intersected with the Moon being down, ranked across up to 62 nights with a trend. The right tool for "when should I stargaze / photograph the Milky Way / observe deep-sky objects". Location required. For plain twilight ti…
| Parameter | Type | Description |
|---|---|---|
| date | string | Night to start from. ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only; outside… |
| nights | integer | How many nights to evaluate and rank. Default 1. |
| moon_illumination_max | number | Treat the Moon as tolerable below this illuminated fraction (0..1) even when up. |
| lat | number | Latitude in decimal degrees, north positive. Send lat and lon together. |
| lon | number | Longitude in decimal degrees, east positive (Lisbon is about -9.14). Send lat and lon together. |
| place | string | Place name instead of lat/lon, as "City" or "City,CC" with an ISO country code, e.g. "Lisbon,PT". Resolved server-side; the response then carries a required Ge… |
| tz | string | IANA timezone like "Europe/Lisbon" to render event times in local time. Optional; a resolved place supplies its own timezone. |
astro_planet_boardAll eight planets in one call for a date and optional location: constellation, magnitude, apparent size, elongation from the Sun, morning or evening sky, retrograde state with the next station, rise/set, and a worth-looking-tonight assessment. The right tool for "which planets are visible tonight".…All eight planets in one call for a date and optional location: constellation, magnitude, apparent size, elongation from the Sun, morning or evening sky, retrograde state with the next station, rise/set, and a worth-looking-tonight assessment. The right tool for "which planets are visible tonight".…
| Parameter | Type | Description |
|---|---|---|
| date | string | ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700 to 2200 only; outside that range the API re… |
| bodies | array | Optional subset of planets: mercury, venus, mars, jupiter, saturn, uranus, neptune, pluto. |
| sort | string | Optional result ordering. Default is by distance from the Sun. |
| lat | number | Latitude in decimal degrees, north positive. Send lat and lon together. |
| lon | number | Longitude in decimal degrees, east positive (Lisbon is about -9.14). Send lat and lon together. |
| place | string | Place name instead of lat/lon, as "City" or "City,CC" with an ISO country code, e.g. "Lisbon,PT". Resolved server-side; the response then carries a required Ge… |
| tz | string | IANA timezone like "Europe/Lisbon" to render event times in local time. Optional; a resolved place supplies its own timezone. |
astro_planet_eventsThe apparition cycle of the inferior planets as dated events: inferior and superior conjunctions, greatest eastern and western elongations, peak brightness (a Venus-only event: Mercury's brightness peaks behind the Sun where it cannot be seen), and the rare transits across the Sun. With no dates it…The apparition cycle of the inferior planets as dated events: inferior and superior conjunctions, greatest eastern and western elongations, peak brightness (a Venus-only event: Mercury's brightness peaks behind the Sun where it cannot be seen), and the rare transits across the Sun. With no dates it…
| Parameter | Type | Description |
|---|---|---|
| bodies | array | Which inferior planets to report. Default both. |
| kinds | array | Optional filter of event kinds. Omit for all. peak_magnitude only ever fires for venus; the transit kinds are body-specific and genuinely rare. |
| date | string | Anchor instant; with no start/end the response covers the next full synodic cycle from here. ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21… |
| start | string | First day of an explicit window (use with end). ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years… |
| end | string | Last day of an explicit window, exclusive. ISO 8601 UTC date or datetime, e.g. "2026-08-06" or "2026-08-06T21:00:00Z". Omit for the current moment. Years 1700… |
| cursor | string | Opaque pagination cursor from a previous result's next_cursor. Send it with the same start/end arguments as the first page. |
| lat | number | Latitude in decimal degrees, north positive. Send lat and lon together. |
| lon | number | Longitude in decimal degrees, east positive (Lisbon is about -9.14). Send lat and lon together. |
| place | string | Place name instead of lat/lon, as "City" or "City,CC" with an ISO country code, e.g. "Lisbon,PT". Resolved server-side; the response then carries a required Ge… |
| tz | string | IANA timezone like "Europe/Lisbon" to render event times in local time. Optional; a resolved place supplies its own timezone. |
astro_find_placeResolve a place name to coordinates, region, country, IANA timezone and a stable place_id, or reverse-look-up the nearest places to a lat/lon. Results are GeoNames data (CC BY 4.0); the response carries the required credit in its attribution field, which must be preserved when results are shown. No…Resolve a place name to coordinates, region, country, IANA timezone and a stable place_id, or reverse-look-up the nearest places to a lat/lon. Results are GeoNames data (CC BY 4.0); the response carries the required credit in its attribution field, which must be preserved when results are shown. No…
| Parameter | Type | Description |
|---|---|---|
| query | string | Place name to search for, e.g. "Springfield". |
| id | string | A place_id from an earlier result, to fetch that exact place. |
| lat | number | Latitude in decimal degrees, north positive. Send lat and lon together. |
| lon | number | Longitude in decimal degrees, east positive (Lisbon is about -9.14). Send lat and lon together. |
| country | string | Two-letter ISO country code filter, e.g. "US". |
| limit | integer | Maximum matches to return. Default 5. |
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Astronomy: sun, moon, planet, eclipse, twilight and star position calculations.
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