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16 lines
722 B
Markdown
//[astronomy](../../index.md)/[io.github.cosinekitty.astronomy](index.md)/[rotationEqjEct](rotation-eqj-ect.md)
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# rotationEqjEct
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fun [rotationEqjEct](rotation-eqj-ect.md)(time: [Time](-time/index.md)): [RotationMatrix](-rotation-matrix/index.md)
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Calculates a rotation matrix from J2000 mean equator (EQJ) to true ecliptic of date (ECT).
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This is one of the family of functions that returns a rotation matrix for converting from one orientation to another. Source: EQJ = equatorial system, using equator at J2000 epoch. Target: ECT = ecliptic system, using true equinox of the specified date/time.
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## Parameters
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| time | The date and time at which the Earth's equator defines the target orientation. |
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