eclipticToEquatorialfunction
A point of the ecliptic frame in the equatorial one (both J2000): the rotation of the sphere about the equinox by the obliquity.
Import it
import { eclipticToEquatorial } from "@johnmorrisdotca/hoshi-stars/chart";Definition
function eclipticToEquatorial(longitude: number, latitude?: number): SkyPointParameters
| Name | Type | Description |
|---|---|---|
longitude | number | The ecliptic longitude in degrees, measured from the March equinox. |
latitude (optional) | number | The ecliptic latitude in degrees (0, the ecliptic itself, when left out). |
Returns
SkyPoint
The point: right ascension 0 to 360 and declination -90 to 90, in degrees.
Examples
import { eclipticToEquatorial } from "@johnmorrisdotca/hoshi-stars/chart";
// the June solstice point: 6 hours of right ascension, 23.44 degrees north
const point = eclipticToEquatorial(90);
console.log(point.rightAscension.toFixed(1), point.declination.toFixed(2));
// 90.0 23.4490.0 23.44What it prints (run when this page was built)