Sunvane Golden Hour

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io.github.theluckystrike/golden-hourv1.0.0

Sun times & shoot planning

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compare_day_length Read-only

Use this when the user asks for day length differences and average change per day between two local dates, or the solstices and equinoxes of a year. Returns daylight duration for each date and signed changes. Limits: cities with population 50,000+ (plus Tromso), dates/years 1900–2100, flat sea-level horizon; use either date_a and date_b or year, and not both. Does not forecast weather.

citystring, required

City name, for example New York. Cities with population 50,000+ are supported; the largest same-name match is used.

yearinteger

Year whose equinox and solstice local dates to compare, for example 2026. Omit date_a/date_b.

statestring

Optional US state name or abbreviation, for example NY or New York.

date_astring

First local date for a two-date comparison, for example 2026-03-20. Required with date_b; omit with year.

date_bstring

Second local date, for example 2026-06-21. Required with date_a; omit with year.

countrystring

Optional country name or two-letter code to narrow the match, for example US.

Tools (3)

compare_day_length

read-only

Argument	Type	Description
city*	string	City name, for example New York. Cities with population 50,000+ are supported; the largest same-name match is used.
year	integer	Year whose equinox and solstice local dates to compare, for example 2026. Omit date_a/date_b.
state	string	Optional US state name or abbreviation, for example NY or New York.
date_a	string	First local date for a two-date comparison, for example 2026-03-20. Required with date_b; omit with year.
date_b	string	Second local date, for example 2026-06-21. Required with date_a; omit with year.
country	string	Optional country name or two-letter code to narrow the match, for example US.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "city"
  ],
  "properties": {
    "city": {
      "type": "string",
      "maxLength": 100,
      "description": "City name, for example New York. Cities with population 50,000+ are supported; the largest same-name match is used."
    },
    "year": {
      "type": "integer",
      "maximum": 2100,
      "minimum": 1900,
      "description": "Year whose equinox and solstice local dates to compare, for example 2026. Omit date_a/date_b."
    },
    "state": {
      "type": "string",
      "maxLength": 40,
      "description": "Optional US state name or abbreviation, for example NY or New York."
    },
    "date_a": {
      "type": "string",
      "maxLength": 10,
      "description": "First local date for a two-date comparison, for example 2026-03-20. Required with date_b; omit with year."
    },
    "date_b": {
      "type": "string",
      "maxLength": 10,
      "description": "Second local date, for example 2026-06-21. Required with date_a; omit with year."
    },
    "country": {
      "type": "string",
      "maxLength": 60,
      "description": "Optional country name or two-letter code to narrow the match, for example US."
    }
  }
}

find_sun_times

Use this when the user asks for a golden hour calculator, golden hour time, sunrise sunset times, sunset time today, what time is golden hour, blue hour, sunrise time, or twilight times for a city and local date. Returns local sunrise, sunset, solar noon, day length, twilight, light windows and sun azimuth. Limits: cities with population 50,000+ (plus Tromso), dates 1900–2100, flat sea-level horizon; Does not model weather or terrain.

read-only

Argument	Type	Description
city*	string	City name, for example New York. Cities with population 50,000+ are supported; the largest same-name match is used.
date*	string	Local calendar date, YYYY-MM-DD, from 1900 to 2100; for example 2026-06-21.
state	string	Optional US state name or abbreviation, for example NY or New York.
country	string	Optional country name or two-letter code to narrow the match, for example US.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "city",
    "date"
  ],
  "properties": {
    "city": {
      "type": "string",
      "maxLength": 100,
      "description": "City name, for example New York. Cities with population 50,000+ are supported; the largest same-name match is used."
    },
    "date": {
      "type": "string",
      "maxLength": 10,
      "description": "Local calendar date, YYYY-MM-DD, from 1900 to 2100; for example 2026-06-21."
    },
    "state": {
      "type": "string",
      "maxLength": 40,
      "description": "Optional US state name or abbreviation, for example NY or New York."
    },
    "country": {
      "type": "string",
      "maxLength": 60,
      "description": "Optional country name or two-letter code to narrow the match, for example US."
    }
  }
}

plan_golden_hour_shoot

Use this when the user wants photography golden hour shoot windows for a city and a date range, with an ICS calendar file and CSV table. Choose morning, evening or both. Limits: 1–31 days, cities with population 50,000+ (plus Tromso), years 1900–2100, flat sea-level horizon; missing polar windows are reported and calendar events are only included for existing windows. Does not access or change a calendar.

read-only

Argument	Type	Description
city*	string	City name, for example New York. Cities with population 50,000+ are supported; the largest same-name match is used.
days*	integer	Number of consecutive days, 1 to 31, for example 7.
state	string	Optional US state name or abbreviation, for example NY or New York.
period*	string	Light windows to include, for example evening. A continuous window includes both periods.
country	string	Optional country name or two-letter code to narrow the match, for example US.
start_date*	string	First local date in YYYY-MM-DD, for example 2026-10-12.

Input schema (JSON)