リファレンス

ユリウス日 (julian パッケージの関数も)、暦、時刻系、恒星時、火星の時刻

import { … } from "@johnmorrisdotca/wakusei-planets/time";

リファレンスの説明と例は英語です。見出しと目次は日本語です。

エクスポート

名前	種類	概要
`B1950_JD`	定数	The Julian date of the Besselian epoch B1950.0, 1950 January 0.923 (Meeus).
`Calendar`	型	Which calendar: `gregorian` and `julian` are used for every year (the proleptic calendars), and `auto` follows history: the Julian calendar to 1582-10-04 and the Gregorian from 1582-10-15.
`CivilTime`	型	A date and time of day.
`convertTimeScale`	関数	A moment on one time scale as the same moment on another, in milliseconds since 1970 read on the target scale's own clock.
`coordinatedMarsTime`	関数	Coordinated Mars Time: the mean solar time on Mars's prime meridian, in hours from 0 up to 24 (a Martian hour is 1/24 of a sol).
`dayOfWeek`	関数	The day of the week of a moment in UTC: 0 Sunday to 6 Saturday.
`dayOfYear`	関数	The day of the year of a moment in UTC: 1 on 1 January.
`daysInMonth`	関数	The number of days in a month; October 1582 has 21 in the `auto` calendar, the ten days of the switch being left out.
`deltaT`	関数	Delta T, terrestrial time minus universal time (UT1), in seconds.
`equationOfTheEquinoxes`	関数	The equation of the equinoxes in degrees: the nutation in longitude times the cosine of the obliquity, what apparent sidereal time has over mean (about 1 second of time at most).
`fromCalendar`	関数	A date and time of day in UTC as a moment, in milliseconds since 1970.
`fromJulianDate`	関数	The time, in milliseconds since 1970, of a Julian date.
`fromJulianDayAndMilliseconds`	関数	A time from a Julian day and the milliseconds into it, with no digit lost: `fromJulianDayAndMilliseconds(toJulianDay(t), toMillisecondsInJulianDay(t))` is `t`.
`greenwichApparentSiderealTime`	関数	The Greenwich apparent sidereal time in degrees, 0 to 360: the mean time with the equation of the equinoxes added, which is what the hour angle of a body is measured against.
`greenwichMeanSiderealTime`	関数	The Greenwich mean sidereal time in degrees, 0 to 360 (divide by 15 for hours).
`isLeapYear`	関数	Whether a year is a leap year.
`J2000_JD`	定数	The Julian date of J2000.0, 2000-01-01 12:00 TT: the epoch of the planets' theories.
`J2000_MS`	定数	J2000.0, 2000-01-01 12:00, as milliseconds since 1970 counted on a clock that reads TT: a terrestrial time is this far from it.
`julian`	関数	A time as a string of its Julian date with six decimals, as the `julian` package gives it (a tenth of a second).
`julianCenturies`	関数	Julian centuries (36,525 days) from J2000.0: the time argument of most theories.
`julianMillennia`	関数	Julian millennia (365,250 days) from J2000.0, in terrestrial time unless `scale` says UTC: the time argument of the VSOP87 series.
`localSiderealTime`	関数	The local sidereal time in degrees, 0 to 360, at a longitude east of Greenwich (west negative): the right ascension on the meridian.
`marsLocalMeanSolarTime`	関数	The local mean solar time on Mars at a longitude east of its prime meridian, in hours from 0 up to 24.
`marsSolDate`	関数	The Mars Sol Date: the count of Martian days, as the Julian date counts Earth's.
`modifiedJulianDate`	関数	The modified Julian date: the Julian date less 2,400,000.5, so a day starts at midnight and the numbers are shorter.
`taiMinusUtc`	関数	TAI minus UTC in seconds: the leap seconds from 1972 (10 then, 37 since 2017), and before 1972 delta T less 32.184, which is how far the atomic scale would have been from the Earth's turn.
`tdbMinusTt`	関数	TDB minus TT in seconds: a term that follows the Earth round the Sun and is never more than 1.7 milliseconds (Meeus's two terms, 0.001657 sin g and 0.000014 sin 2g, good to about 30 microseconds).
`TimeScale`	型	A time scale: `utc` (the clock), `ut1` (the Earth's turn, within 0.9 s of UTC), `tai` (atomic time), `gps` (TAI less 19 s), `tt` (terrestrial time, TAI plus 32.184 s) and `tdb` (barycentric dynamical time, TT plus a few milliseconds that follow the year).
`toCalendar`	関数	A moment as a date and time of day in UTC, in the Gregorian or the Julian calendar.
`toDate`	関数	The `Date` of a Julian date (a number, or the string `julian` gives), rounded to the millisecond.
`toJulianDate`	関数	A time as a Julian date: the days since noon on 1 January 4713 BC (Julian calendar), as a number.
`toJulianDay`	関数	The whole Julian day of a time.
`toMillisecondsInJulianDay`	関数	The milliseconds since noon, the start of the Julian day, that a time is into it.
`toTerrestrialTime`	関数	A moment in UTC as the same moment in terrestrial time, on the same scale of milliseconds since 1970.
`ttMinusUtc`	関数	Terrestrial time minus the clock's time, in seconds, at a moment given in UTC: 69.184 from the last leap second in 2017 on (until another is added), exact from 1972, and delta T before.
`UNIX_EPOCH_JULIAN_DATE`	定数	The Julian date of the Unix epoch, 1970-01-01T00:00:00Z (UTC).
`When`	型	A moment: a `Date` or a number of milliseconds since 1970 (UTC, as JavaScript counts).

ソースを見る GitHub で編集@johnmorrisdotca/wakusei-planets 0.24.0 のソースから作成しました。

この日本語は、まだ日本語を母語とする方の確認を受けていません。訂正を歓迎します。