Reference

/chart

import { … } from "@johnmorrisdotca/hoshi-stars/chart";

201.8 kB minified and gzipped, with everything it imports (measured with esbuild)

Exports

Name	Kind	What it is
`bodyRadius`	function	How big a body's dot is drawn, in pixels: a star's rule (brighter is larger), carried to magnitude -4.6 so that Venus is larger than Sirius.
`CHART_LAYERS`	constant	The layers a published chart draws: the Milky Way, the figures' lines, the constellation boundaries, the names, the deep-sky objects, the black holes, the ecliptic (the Sun's yearly path, dashed) and the grid.
`ChartLayer`	type	One of `CHART_LAYERS`.
`chartSvg`	function	The sky chart as a complete SVG element, as a string: the stars, and the layers asked for, laid out for `width` by `height`, on the night background.
`ChartSvgOptions`	type	What to draw.
`dimsForUncertainty`	function	Whether the "show uncertainty" look draws a star dimmer: a grade C star (a rough or missing distance) is, grades A and B are not.
`eclipticLine`	function	The ecliptic as points of the equatorial sky, a degree of longitude apart by default, closed (the last is the first).
`eclipticToEquatorial`	function	A point of the ecliptic frame in the equatorial one (both J2000): the rotation of the sphere about the equinox by the obliquity.
`MarkerRange`	type	The moments to show: markers dated from `from` to `to`, both ends included.
`markersFromCsv`	function	Markers from CSV text, the way `markersToCsv` writes it: a header row naming the columns (`ra` and `dec` are needed; `id`, `date`, `label`, `color`, `size` and `group` are used when present, in any order).
`markerSpan`	function	The first and last moment among the markers: what a time slider spans.
`markersToCsv`	function	The markers as CSV, one row each, with a header: `id,ra,dec,date,label,color,size,group`.
`markerTime`	function	A moment in milliseconds since 1970.
`MarkerTrack`	type	A group joined in date order.
`markerTracks`	function	The groups to join, each in date order, from the markers a range let through.
`MarkerWhen`	type	A moment: an ISO 8601 text (`2026-11-08` or `2026-11-08T21:30:00Z`), milliseconds since 1970 (what `Date.now()` and `getTime()` give), or a `Date`.
`normaliseBodies`	function	Cleans a list that came as text (the `bodies` attribute is JSON): an entry with no id, no place or no brightness is dropped; a missing name falls back to the other language, else the id; a bad phase counts as full; a bad `size` or `brightLimb` is dropped; of two entries with the same id the first is kept.
`normaliseMarkers`	function	Markers from a list: what `JSON.parse` gave, or any array.
`OBLIQUITY_J2000`	constant	The mean obliquity of the ecliptic at J2000, the tilt of the Earth's axis to its orbit, in degrees: 84,381.406 arc-seconds, the value the IAU 2006 precession model (Capitaine, Wallace and Chapront 2003) fixes.
`pickAccuracy`	function	The grade and the ± of a star, for a pick: the grade, the distance range and the position resolution.
`PickAccuracy`	type	The grade and the ± of a picked star: what `hoshi-pick` carries in `accuracy` for a star.
`SkyBody`	type	One body to draw over the stars: a planet, the Moon, a dwarf planet.
`SkyBodyNames`	type	The names of a body in the two languages of the chart.
`SkyMarker`	type	One point of your own on the chart.
`UNCERTAIN_OPACITY`	constant	How much of its own strength a grade C star is drawn at when the uncertainty is shown (its `fill-opacity`).
`VisibleMarker`	type	A marker the range lets through: the marker, its place in the list, the id it answers to, its moment in milliseconds and how strongly it is drawn.
`visibleMarkers`	function	The markers a time range lets through, in the order given, each with how strongly it is drawn.

View source Edit on GitHubMade from the source of @johnmorrisdotca/hoshi-stars 0.47.0.