datatypevoid/getMoonPhase.ts

Alkalurops · 2021-02-02T22:53:10Z

What is the license of this nice code? MIT?

datatypevoid · 2021-02-10T20:03:52Z

@Alkalurops The essence of the algorithm was taken from http://www.voidware.com/moon_phase.htm/https://gist.github.com/endel/dfe6bb2fbe679781948c which does not name a source nor license unfortunately. I only ported it to TypeScript and modified it to suit my coding style and preferences.

whiteangelnoor · 2021-02-13T10:29:38Z

Datatypevoid

Great work!can make this as react native app

Alkalurops · 2021-02-13T16:10:24Z

@Alkalurops The essence of the algorithm was taken from http://www.voidware.com/moon_phase.htm/https://gist.github.com/endel/dfe6bb2fbe679781948c which does not name a source nor license unfortunately. I only ported it to TypeScript and modified it to suit my coding style and preferences.

Alright thanks!

Termplexed · 2021-03-01T22:39:40Z

Not sure about typescript, but if same as JS it looks to be some errors:

Date.prototype.getDay() returns day of week, not day of month, use .getDate()
Date.prototype.getMonth() is zero based, use .getMonth() + 1
DAYS_SINCE_NEW_MOON_1900_01_01 - not sure what that is ( 694039.09).

It is close to days from year 0 to March 1900 - more precisely Tuesday March 20th 1900, or Thursday 21st if one count form year 1. Wednesday 20th of March 1901 had a new moon at 12:52 UTC+0, but that is not 1st of January ... 1st of January 1900 had a new-moon at 13:51 (if I remember correctly), 693595 or 693597 days from 001-01-01 or 693961 MySQL TO_DAYS from 0000-00-00.

Does it have something to do with Julian/Gregorian/Roman calendars?

husayt · 2021-04-03T16:08:53Z

Here is a revised version, which works (also, added icons and an override)

export {
  EMoonPhase,
  moonIcons,
  moonPhaseAlt,
  EMoonPhaseName,
  MOON_PHASE_NAMES,
  moonPhase,
}

const { round, trunc: truncate } = Math

enum EMoonPhase {
  New = 0,
  WaxingCrescent,
  QuarterMoon,
  WaxingGibbous,
  Full,
  WaningGibbous,
  LastQuarter,
  WaningCrescent,
  COUNT = 8,
}

const moonIcons: [
  New: string,
  WaxingCrescent: string,
  QuarterMoon: string,
  WaxingGibbous: string,
  Full: string,
  WaningGibbous: string,
  LastQuarter: string,
  WaningCrescent: string
] = ["🌑", "🌒", "🌓", "🌔", "🌕", "🌖", "🌗", "🌘"]

enum EMoonPhaseName {
  New = "New",
  WaxingCrescent = "Waxing Crescent",
  QuarterMoon = "Quarter Moon",
  WaxingGibbous = "Waxing Gibbous",
  Full = "Full",
  WaningGibbous = "Waning Gibbous",
  LastQuarter = "Last Quarter",
  WaningCrescent = "Waning Crescent",
  COUNT = "COUNT",
}

const MOON_PHASE_NAMES: EMoonPhaseName[] = [
  // Look-up table.
  EMoonPhaseName.New,
  EMoonPhaseName.WaxingCrescent,
  EMoonPhaseName.QuarterMoon,
  EMoonPhaseName.WaxingGibbous,
  EMoonPhaseName.Full,
  EMoonPhaseName.WaningGibbous,
  EMoonPhaseName.LastQuarter,
  EMoonPhaseName.WaningCrescent,
  EMoonPhaseName.COUNT,
]

// Reference: http://individual.utoronto.ca/kalendis/lunar/#FALC
// Also known as a synodic month.
// An average synodic month takes 29 days, 12 hours, 44 minutes, 3 seconds.
const LUNAR_CYCLE = 29.5305882 // 29.53058770576

const DAYS_PER_YEAR = 365.25
const DAYS_PER_MONTH = 30.6

// Number of days since known new moon on `1900-01-01`.
const DAYS_SINCE_NEW_MOON_1900_01_01 = 694039.09

interface IResult {
  name: EMoonPhaseName
  phase: EMoonPhase
  icon: string
}

function moonPhaseAlt(date: Date = new Date()): IResult {
  // let year = date.getYear()
  let year: number = date.getFullYear()

  let month: number = date.getMonth() + 1
  const day: number = date.getDate()
  return moonPhase(year, month, day)
}

// Ported from `http://www.voidware.com/moon_phase.htm`.
function moonPhase(year: number, month: number, day: number): IResult {
  if (month < 3) {
    year--
    month += 12
  }

  month += 1

  let totalDaysElapsed: number =
    DAYS_PER_YEAR * year +
    DAYS_PER_MONTH * month +
    day -
    DAYS_SINCE_NEW_MOON_1900_01_01

  totalDaysElapsed /= LUNAR_CYCLE // Divide by the lunar cycle.

  let phase: number = truncate(totalDaysElapsed)

  /*
    Subtract integer part to leave fractional part of original
    `totalDaysElapsed`.
   */
  totalDaysElapsed -= phase

  // Scale fraction from `0-8`.
  phase = round(totalDaysElapsed * 8)
  if (phase >= 8) phase = 0 // `0` and `8` are the same so turn `8` into `0`.

  if (phase >= EMoonPhase.COUNT || phase < EMoonPhase.New)
    throw new Error(`Invalid moon phase: ${phase}`)

  return { phase, name: MOON_PHASE_NAMES[phase], icon: moonIcons[phase] }
}

datatypevoid · 2021-04-03T16:18:40Z

Here is a revised version, which works (also, added icons and an override)

export {
  EMoonPhase,
  moonIcons,
  moonPhaseAlt,
  EMoonPhaseName,
  MOON_PHASE_NAMES,
  moonPhase,
}

const { round, trunc: truncate } = Math

enum EMoonPhase {
  New = 0,
  WaxingCrescent,
  QuarterMoon,
  WaxingGibbous,
  Full,
  WaningGibbous,
  LastQuarter,
  WaningCrescent,
  COUNT = 8,
}

const moonIcons: [
  New: string,
  WaxingCrescent: string,
  QuarterMoon: string,
  WaxingGibbous: string,
  Full: string,
  WaningGibbous: string,
  LastQuarter: string,
  WaningCrescent: string
] = ["🌑", "🌒", "🌓", "🌔", "🌕", "🌖", "🌗", "🌘"]

enum EMoonPhaseName {
  New = "New",
  WaxingCrescent = "Waxing Crescent",
  QuarterMoon = "Quarter Moon",
  WaxingGibbous = "Waxing Gibbous",
  Full = "Full",
  WaningGibbous = "Waning Gibbous",
  LastQuarter = "Last Quarter",
  WaningCrescent = "Waning Crescent",
  COUNT = "COUNT",
}

const MOON_PHASE_NAMES: EMoonPhaseName[] = [
  // Look-up table.
  EMoonPhaseName.New,
  EMoonPhaseName.WaxingCrescent,
  EMoonPhaseName.QuarterMoon,
  EMoonPhaseName.WaxingGibbous,
  EMoonPhaseName.Full,
  EMoonPhaseName.WaningGibbous,
  EMoonPhaseName.LastQuarter,
  EMoonPhaseName.WaningCrescent,
  EMoonPhaseName.COUNT,
]

// Reference: http://individual.utoronto.ca/kalendis/lunar/#FALC
// Also known as a synodic month.
// An average synodic month takes 29 days, 12 hours, 44 minutes, 3 seconds.
const LUNAR_CYCLE = 29.5305882 // 29.53058770576

const DAYS_PER_YEAR = 365.25
const DAYS_PER_MONTH = 30.6

// Number of days since known new moon on `1900-01-01`.
const DAYS_SINCE_NEW_MOON_1900_01_01 = 694039.09

interface IResult {
  name: EMoonPhaseName
  phase: EMoonPhase
  icon: string
}

function moonPhaseAlt(date: Date = new Date()): IResult {
  // let year = date.getYear()
  let year: number = date.getFullYear()

  let month: number = date.getMonth() + 1
  const day: number = date.getDate()
  return moonPhase(year, month, day)
}

// Ported from `http://www.voidware.com/moon_phase.htm`.
function moonPhase(year: number, month: number, day: number): IResult {
  if (month < 3) {
    year--
    month += 12
  }

  month += 1

  let totalDaysElapsed: number =
    DAYS_PER_YEAR * year +
    DAYS_PER_MONTH * month +
    day -
    DAYS_SINCE_NEW_MOON_1900_01_01

  totalDaysElapsed /= LUNAR_CYCLE // Divide by the lunar cycle.

  let phase: number = truncate(totalDaysElapsed)

  /*
    Subtract integer part to leave fractional part of original
    `totalDaysElapsed`.
   */
  totalDaysElapsed -= phase

  // Scale fraction from `0-8`.
  phase = round(totalDaysElapsed * 8)
  if (phase >= 8) phase = 0 // `0` and `8` are the same so turn `8` into `0`.

  if (phase >= EMoonPhase.COUNT || phase < EMoonPhase.New)
    throw new Error(`Invalid moon phase: ${phase}`)

  return { phase, name: MOON_PHASE_NAMES[phase], icon: moonIcons[phase] }
}

🔥 🚀 👍 Love the icon addition.

EricHech · 2022-06-23T04:59:42Z

This is awesome, thank you. I cleaned up some of the typescript, improved some variable names, and added the lunary day:

export const MOON_ICONS = ["🌑", "🌒", "🌓", "🌔", "🌕", "🌖", "🌗", "🌘"] as const;

export const MOON_PHASE_NAMES = [
  "New",
  "Waxing Crescent",
  "Quarter Moon",
  "Waxing Gibbous",
  "Full",
  "Waning Gibbous",
  "Last Quarter",
  "Waning Crescent",
] as const;

/**
 * Reference: http://individual.utoronto.ca/kalendis/lunar/#FALC - Also known as a synodic month.
 * An average synodic month takes 29 days, 12 hours, 44 minutes, 3 seconds.
 */
export const LUNAR_CYCLE = 29.5305882; // 29.53058770576

export const DAYS_PER_YEAR = 365.25;

export const DAYS_PER_MONTH = 30.6;

/** The number of days between `0 AD` and the new moon on `1900-01-01`. */
export const NEW_MOON_REFERENCE = 694039.09;

// Ported from `http://www.voidware.com/moon_phase.htm`.
export const getMoonPhase = (date: Date = new Date()) => {
  let year = date.getFullYear();
  let month = date.getMonth() + 1;
  const day = date.getDate();

  if (month < 3) {
    year -= 1;
    month += 12;
  }

  month += 1;

  const daysSinceZeroAd = DAYS_PER_YEAR * year + DAYS_PER_MONTH * month + day;
  const daysSinceNewMoonReference = daysSinceZeroAd - NEW_MOON_REFERENCE;

  const numberOfCyclesSinceReference = daysSinceNewMoonReference / LUNAR_CYCLE;

  const percentageOfCycleComplete = numberOfCyclesSinceReference - Math.trunc(numberOfCyclesSinceReference);

  // Scale fraction from 0 to 8
  let phase = Math.round(percentageOfCycleComplete * 8);
  if (phase >= 8) phase = 0; // `0` and `8` are the same so turn `8` into `0`.

  // Scale fraction from 0 to `LUNAR_CYCLE`
  const lunarDay = Math.round(percentageOfCycleComplete * LUNAR_CYCLE);

  if (!MOON_PHASE_NAMES[phase]) throw new Error(`Invalid moon phase: ${phase}`);

  return { lunarDay, name: MOON_PHASE_NAMES[phase], icon: MOON_ICONS[phase] };
};

whiteangelnoor · 2022-06-23T08:38:56Z

This is awesome, thank you. I cleaned up some of the typescript, improved some variable names, and added the lunary day:

export const MOON_ICONS: [
  New: string,
  WaxingCrescent: string,
  QuarterMoon: string,
  WaxingGibbous: string,
  Full: string,
  WaningGibbous: string,
  LastQuarter: string,
  WaningCrescent: string
] = ["🌑", "🌒", "🌓", "🌔", "🌕", "🌖", "🌗", "🌘"];

export const MOON_PHASE_NAMES = [
  "New",
  "Waxing Crescent",
  "Quarter Moon",
  "Waxing Gibbous",
  "Full",
  "Waning Gibbous",
  "Last Quarter",
  "Waning Crescent",
] as const;

/**
 * Reference: http://individual.utoronto.ca/kalendis/lunar/#FALC - Also known as a synodic month.
 * An average synodic month takes 29 days, 12 hours, 44 minutes, 3 seconds.
 */
export const LUNAR_CYCLE = 29.5305882; // 29.53058770576

export const DAYS_PER_YEAR = 365.25;

export const DAYS_PER_MONTH = 30.6;

/** The number of days between `0 AD` and the new moon on `1900-01-01`. */
export const NEW_MOON_REFERENCE = 694039.09;

// Ported from `http://www.voidware.com/moon_phase.htm`.
export const getMoonPhase = (date: Date = new Date()) => {
  let year = date.getFullYear();
  let month = date.getMonth() + 1;
  const day = date.getDate();

  if (month < 3) {
    year -= 1;
    month += 12;
  }

  month += 1;

  const daysSinceZeroAd = DAYS_PER_YEAR * year + DAYS_PER_MONTH * month + day;
  const daysSinceNewMoonReference = daysSinceZeroAd - NEW_MOON_REFERENCE;

  const numberOfCyclesSinceReference = daysSinceNewMoonReference / LUNAR_CYCLE;

  const percentageOfCycleComplete = numberOfCyclesSinceReference - Math.trunc(numberOfCyclesSinceReference);

  // Scale fraction from 0 to 8
  let phase = Math.round(percentageOfCycleComplete * 8);
  if (phase >= 8) phase = 0; // `0` and `8` are the same so turn `8` into `0`.

  // Scale fraction from 0 to `LUNAR_CYCLE`
  const lunarDay = Math.round(percentageOfCycleComplete * LUNAR_CYCLE);

  if (!MOON_PHASE_NAMES[phase]) throw new Error(`Invalid moon phase: ${phase}`);

  return { lunarDay, name: MOON_PHASE_NAMES[phase], icon: MOON_ICONS[phase] };
};

hey Eric can you send your emil or WhatsApp

EricHech · 2022-06-23T15:31:54Z

GitHub doesn't allow users to share emails. What's up?

whiteangelnoor · 2022-06-23T16:38:59Z

GitHub doesn't allow users to share emails. What's up?

i think her can not connect. i tried to inter to your website but dont work?

whiteangelnoor · 2022-06-23T16:39:41Z

can you develop , calculate moon manzel?

EricHech · 2022-06-23T18:36:10Z

Yes, I think that wouldn't be too hard to add with some investigation into calculating lunar degrees.

whiteangelnoor · 2022-06-23T18:43:17Z

how can have contact with you?

EricHech · 2022-06-23T19:06:28Z

sent you a repo collab

whiteangelnoor · 2022-06-23T19:06:38Z

Yes, I think that wouldn't be too hard to add with some investigation into calculating lunar degrees.

how contact with you

EricHech · 2022-06-23T19:09:22Z

You're cluttering up the gist man. I sent you a repo collaboration invite so you can contact me through the codebase.

whiteangelnoor · 2022-06-23T19:19:15Z

You're cluttering up the gist man. I sent you a repo collaboration invite so you can contact me through the codebase.

i didnt have and received any thing

whiteangelnoor · 2022-06-23T19:25:52Z

i accept it.now what?

EricHech · 2022-06-23T20:21:44Z

This is my last message here. Check the README. My email is there.

datatypevoid/getMoonPhase.ts

Alkalurops commented Feb 2, 2021

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whiteangelnoor commented Feb 13, 2021

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EricHech commented Jun 23, 2022


	export { EMoonPhase, EMoonPhaseName, MOON_PHASE_NAMES, moonPhase }


	const { round, trunc: truncate } = Math


	enum EMoonPhase {
	New = 0,
	WaxingCrescent,
	QuarterMoon,
	WaxingGibbous,
	Full,
	WaningGibbous,
	LastQuarter,
	WaningCrescent,
	COUNT = 8
	}


	enum EMoonPhaseName {
	New = 'New',
	WaxingCrescent = 'Waxing Crescent',
	QuarterMoon = 'Quarter Moon',
	WaxingGibbous = 'Waxing Gibbous',
	Full = 'Full',
	WaningGibbous = 'Waning Gibbous',
	LastQuarter = 'Last Quarter',
	WaningCrescent = 'Waning Crescent',
	COUNT = 'COUNT'
	}


	const MOON_PHASE_NAMES: EMoonPhaseName[] = [ // Look-up table.
	EMoonPhaseName.New,
	EMoonPhaseName.WaxingCrescent,
	EMoonPhaseName.QuarterMoon,
	EMoonPhaseName.WaxingGibbous,
	EMoonPhaseName.Full,
	EMoonPhaseName.WaningGibbous,
	EMoonPhaseName.LastQuarter,
	EMoonPhaseName.WaningCrescent,
	EMoonPhaseName.COUNT
	]


	// Reference: http://individual.utoronto.ca/kalendis/lunar/#FALC
	// Also known as a synodic month.
	// An average synodic month takes 29 days, 12 hours, 44 minutes, 3 seconds.
	const LUNAR_CYCLE = 29.53058770576

	const DAYS_PER_YEAR = 365.25
	const DAYS_PER_MONTH = 30.6

	// Number of days since known new moon on `1900-01-01`.
	const DAYS_SINCE_NEW_MOON_1900_01_01 = 694039.09


	interface IResult { name: EMoonPhaseName, phase: EMoonPhase }


	// Ported from `http://www.voidware.com/moon_phase.htm`.
	function moonPhase (date: Date = new Date()): IResult {

	// let year = date.getYear()
	let year: number = date.getFullYear()

	let month: number = date.getMonth()
	const day: number = date.getDay()

	if (month < 3) {
	year--
	month += 12
	}

	month++

	let totalDaysElapsed: number = DAYS_PER_YEAR
	* year
	+ DAYS_PER_MONTH
	* month
	+ day
	- DAYS_SINCE_NEW_MOON_1900_01_01

	totalDaysElapsed /= LUNAR_CYCLE // Divide by the lunar cycle.

	let phase: number = truncate(totalDaysElapsed)

	/*
	Subtract integer part to leave fractional part of original
	`totalDaysElapsed`.
	*/
	totalDaysElapsed -= phase

	// Scale fraction from `0-8`.
	phase = round(totalDaysElapsed * 8)
	phase = phase & 7 // `0` and `8` are the same so turn `8` into `0`.

	if (phase >= EMoonPhase.COUNT \|\| phase < EMoonPhase.New)
	throw new Error(`Invalid moon phase: ${phase}`)

	return { phase, name: MOON_PHASE_NAMES[phase] }

	}

datatypevoid/getMoonPhase.ts

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