Moon & Star Map

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io.github.theluckystrike/sky-keepsakev1.0.0

Moon phases & star map posters

Design & Creative

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find_moon_phase Read-only

Use this when the user asks what the moon looked like on a date (birthday, wedding, first date), the moon phase today or tonight, whether two people's birthday moons complete each other ("our moons make a full moon"), or wants a moon phase calendar for a month. Returns phase name, illumination %, moon age, waxing/waning, exact phase times and the next full and new moon, computed with astronomical algorithms. Does not give astrology readings, tides or moonrise times. Do not use for planets or eclipses.

citystring

City (with state or country if ambiguous) that sets the time zone and hemisphere, e.g. "Austin, Texas" or "Sydney, Australia". Without it, dates are read in UTC.

datesarray

Dates to look up as YYYY-MM-DD, optionally with a local time YYYY-MM-DDTHH:MM, e.g. ["1998-07-14"] for a birthday or ["1996-05-02", "1997-11-20"] for a couple. Omit for the Moon right now.

monthstring

A month YYYY-MM for a moon-phase calendar of every day plus the exact new, quarter and full moon times, e.g. 2026-01.

labelsarray

Optional names for the dates in the same order, e.g. ["Anna", "Ben"].

Tools (3)

find_moon_phase

read-only

Argument	Type	Description
city	string	City (with state or country if ambiguous) that sets the time zone and hemisphere, e.g. "Austin, Texas" or "Sydney, Australia". Without it, dates are read in UTC.
dates	array	Dates to look up as YYYY-MM-DD, optionally with a local time YYYY-MM-DDTHH:MM, e.g. ["1998-07-14"] for a birthday or ["1996-05-02", "1997-11-20"] for a couple. Omit for the Moon right now.
month	string	A month YYYY-MM for a moon-phase calendar of every day plus the exact new, quarter and full moon times, e.g. 2026-01.
labels	array	Optional names for the dates in the same order, e.g. ["Anna", "Ben"].

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "city": {
      "type": "string",
      "maxLength": 120,
      "description": "City (with state or country if ambiguous) that sets the time zone and hemisphere, e.g. \"Austin, Texas\" or \"Sydney, Australia\". Without it, dates are read in UTC."
    },
    "dates": {
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 40
      },
      "maxItems": 12,
      "description": "Dates to look up as YYYY-MM-DD, optionally with a local time YYYY-MM-DDTHH:MM, e.g. [\"1998-07-14\"] for a birthday or [\"1996-05-02\", \"1997-11-20\"] for a couple. Omit for the Moon right now."
    },
    "month": {
      "type": "string",
      "maxLength": 24,
      "description": "A month YYYY-MM for a moon-phase calendar of every day plus the exact new, quarter and full moon times, e.g. 2026-01."
    },
    "labels": {
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 40
      },
      "maxItems": 12,
      "description": "Optional names for the dates in the same order, e.g. [\"Anna\", \"Ben\"]."
    }
  }
}

generate_moon_poster

Use this when the user wants a printable moon phase poster: the moon on one special date, two dates side by side ("our moons" couple print), or a lunar calendar of a whole year. Computes the real phases and returns a preview plus vector PDFs (12x18 in, 18x24 in, A3, Letter, A4) and SVG. Does not sell or ship prints. Do not use for a quick phase answer without a poster; that is find_moon_phase.

read-only

Argument	Type	Description
city	string	City for the time zone and hemisphere (southern hemisphere moons are drawn mirrored), e.g. "Melbourne, Australia". Default UTC.
kind*	string	moon: one date's moon as a large print; pair: two dates side by side (e.g. two birthdays) with whether they complete each other; year: a lunar calendar of all 365 days. Example: pair.
year	integer	For year: the calendar year, e.g. 2027.
dates	array	For moon: one date; for pair: two dates. YYYY-MM-DD, optionally with a local time YYYY-MM-DDTHH:MM, e.g. ["1995-03-14", "1996-09-02"].
theme	string	midnight (default), black, paper, or ink.
title	string	Poster headline, e.g. "The moon on the day you were born".
labels	array

generate_star_map

Use this when the user wants a star map or night sky poster for a date and place: the sky over a city on a birthday, wedding, anniversary or the night they met, or the sky tonight. Computes the real positions of about 2,900 stars, constellation lines and the Moon for the city's local time (time zones and DST handled) and returns a preview plus vector poster PDFs (12x18 in, 18x24 in, A3, Letter, A4) and SVG. Takes a city name, not coordinates. Does not draw planets and is not for navigation or telescope pointing.

read-only

Argument	Type	Description
city*	string	City the sky is seen from, with state or country if ambiguous, e.g. "Austin, Texas", "Paris, France", "Kraków". Not coordinates.
date*	string	Local date YYYY-MM-DD, e.g. 2019-06-21, or "tonight" for the sky tonight.
time	string	Local clock time HH:MM (24 h) or 9:30 pm, e.g. 22:15. Default 21:00.
theme	string	Colour style: midnight (navy and gold, default), black, paper (cream with a navy sky disc), ink (white, printer-friendly).
title	string	Poster headline, e.g. "The night we met".
labels	boolean	Label the brightest stars and constellations, e.g. false (default, cleaner keepsake look).