Reference

/meteors

import { … } from "@johnmorrisdotca/chikyu-earth/meteors";

Exports

Name	Kind	What it is
`activeShowers`	function	The showers active at a moment, strongest first, each with its rate then.
`apexPoint`	function	The place on the Earth that faces the way the Earth is travelling round the Sun (the apex of its way): it sits on the morning side, which sweeps up more meteors than the evening side.
`darkness`	function	How dark the sky is at a place, from 0 (the Sun is up) to 1 (the Sun is 6 degrees or more below the horizon, the end of civil twilight), rising evenly between: meteors are counted as seen only where it is dark.
`hourlyRateAt`	function	How many meteors an ideal watcher at a place would count in an hour under a perfect dark sky, whether or not it is dark there: the sporadic background, a little more on the side that faces the Earth's way and a little less on the other, plus each active shower's rate times the sine of its radiant's height (none where the radiant is below the horizon).
`IAU_MDC`	constant	Where the IAU Meteor Data Center's lists are, when they were read, and how it asks to be cited.
`METEOR_HEIGHT_KM`	constant	The heights between which most meteors shine, in kilometres above the ground: they light up near the top and have burnt out by the bottom.
`METEOR_LINKS`	constant	Every shower of the table with its link to the IAU Meteor Data Center, in the table's order.
`METEOR_SHOWERS`	constant	The working list, in the order of the year.
`METEOR_SLOTS`	constant	The most streaks alive at once: the size of the one mesh they are drawn as.
`METEOR_STRENGTH_DEFAULT`	constant	How strongly the meteors are drawn when a page says nothing: 1, the look they have always had.
`METEORS_PER_SECOND_MAX`	constant	The most streaks drawn in a second, however strong the shower.
`MeteorShower`	type	One meteor shower of the working list.
`meteorSky`	function	The meteor sky of a moment (see `MeteorSky`).
`MeteorSky`	type	What decides the meteors over the whole Earth at one moment, worked out once: the active showers with the places their radiants stand over, and the apex.
`ParentBody`	type	The comet or asteroid a shower's meteors come from, as the IAU Meteor Data Center names it.
`parentBodyOf`	function	The parent body of a shower, found by the shower's IAU code, as the IAU Meteor Data Center's origin column names it.
`placeVector`	function	A place as a unit vector: x to longitude 90 east on the equator, y to the north pole, z to longitude 0 on the equator (the realistic Earth's own axes).
`pointBeneath`	function	The place on the Earth where a point of the sky stands overhead at a moment: for a shower's radiant, the middle of the half of the Earth its meteors fall on.
`readMeteorStrength`	function	What a page's `meteors-strength` attribute means: a number from 0 (no streaks are drawn) to 1 (the full look), given as it is written; with none, or something that is not a number, `METEOR_STRENGTH_DEFAULT`.
`ShowerLink`	type	One shower's link to the IAU Meteor Data Center's lists, with where each figure of its row comes from.
`showerRate`	function	How strong a shower is at a moment: its zenithal hourly rate then, 0 outside its dates.
`showersOfParent`	function	The showers that come from one parent body, found by its designation (the whole designation, or just its number or name: `2P` and `Encke` both find `2P/Encke`).
`showerSource`	function	Where a row's figures come from, in a sentence: the International Meteor Organization's table for the dates, the radiant, the speed and the rate, the IAU Meteor Data Center for the name, the parent body and the check, and which of the radiant and speed were replaced by the IAU's.
`solarLongitude`	function	The Sun's longitude along the ecliptic for the equinox of 2000.0, in degrees: the measure the shower list times its maxima by.
`SPORADIC_HOURLY_RATE`	constant	The hourly rate taken for the meteors that belong to no shower (the sporadic background), for an ideal watcher under a perfect sky.
`streakPath`	function	Where one streak runs: from `start` to `end`, in Earth radii from the centre, in the Earth's own axes.
`streaksPerSecond`	function	How many streaks a second are drawn for a mean hourly rate over the dark part of the view: 2.5 a second where the whole view is dark on a night with no shower, more with a shower but squeezed (the 0.6th power) and never over nine, none where nothing in view is dark.

View source Edit on GitHubMade from the source of @johnmorrisdotca/chikyu-earth 0.51.1.