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Angle\nSimple angle unit converter for TypeScript\n\n## Install\n```sh\nnpm install --save @hscmap/angle\n```\n\n## Example\n```typescript\nimport { Angle, EquatorialCoord } from \"@hscmap/angle\"\n\n\nfunction equal(a: number, b: number) {\n    return Math.abs(a / b - 1) \u003c= 1.e-6 || Math.abs((a - 1) / (b - 1) - 1) \u003c= 1.e-6\n}\n\nfunction assertEqual(a: number, b: number) {\n    console.assert(equal(a, b))\n}\n\n\nfunction assetArrayEqual(a: number[], b: number[]) {\n    console.assert(a.every((c, i) =\u003e equal(c, b[i])))\n}\n\n\nassertEqual(Angle.fromRad(Math.PI / 4).deg, 45)\nassertEqual(Angle.fromDeg(45).rad, Math.PI / 4)\nassertEqual(Angle.fromAmin(60).deg, 1)\nassertEqual(Angle.fromAsec(1).deg, 1 / 3600)\nassertEqual(Angle.fromDeg(1).amin, 60)\nassertEqual(Angle.fromDeg(1).asec, 3600)\n\n\n!(function eq2xyz() {\n    assetArrayEqual(EquatorialCoord.fromDeg(0, 0).xyz, [1, 0, 0])\n    assetArrayEqual(EquatorialCoord.fromDeg(90, 0).xyz, [0, 1, 0])\n    assetArrayEqual(EquatorialCoord.fromDeg(90, 90).xyz, [0, 0, 1])\n    assetArrayEqual(EquatorialCoord.fromDeg(0, -45).xyz, [Math.SQRT1_2, 0, -Math.SQRT1_2])\n    assetArrayEqual(EquatorialCoord.fromDeg(-45, -45).xyz, [1 / 2, - 1 / 2, -Math.SQRT1_2])\n})()\n\n\n!(function xyz2eq() {\n    function assertADEqual(eq: EquatorialCoord, a: Angle, d: Angle) {\n        assetArrayEqual([eq.a.rad, eq.d.rad], [a.rad, d.rad])\n    }\n\n    assertADEqual(EquatorialCoord.fromXyz([1, 0, 0]), Angle.fromDeg(0), Angle.fromDeg(0))\n    assertADEqual(EquatorialCoord.fromXyz([0, 1, 0]), Angle.fromDeg(90), Angle.fromDeg(0))\n    assertADEqual(EquatorialCoord.fromXyz([0, 0, 1]), Angle.fromDeg(0), Angle.fromDeg(90))\n    assertADEqual(EquatorialCoord.fromXyz([Math.SQRT1_2, 0, -Math.SQRT1_2]), Angle.fromDeg(0), Angle.fromDeg(-45))\n    assertADEqual(EquatorialCoord.fromXyz([1/2, -1/2, -Math.SQRT1_2]), Angle.fromDeg(315), Angle.fromDeg(-45))\n})()\n\n\n!(function simple_coord_parse() {\n    const eq = EquatorialCoord.parse(`29 41`)\n    assertEqual(eq.a.deg, 29)\n    assertEqual(eq.d.deg, 41)\n})()\n\n\n!(function m81_coord_parse() {\n    const eq = EquatorialCoord.parse(`(RA, α) 09h 55m 33.17306s (Dec, δ) +69° 03′ 55.0610″`)\n    assertEqual(eq.a.deg, 148.88822108386302)\n    assertEqual(eq.d.deg, 69.06529472246791)\n})()\n\n\n!(function m81_coord_unparse() {\n    const eq = EquatorialCoord.parse(`(RA, α) 09h 55m 33.17306s (Dec, δ) +69° 03′ 55.0610″`)\n    const { a, d } = eq.toString()\n    console.assert(a == '09:55:33.1731')\n    console.assert(d == '+69:03:55.0610')\n})()\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmichitaro%2Fangle","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fmichitaro%2Fangle","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmichitaro%2Fangle/lists"}