Rotation Matrix from EQD to ECT

Calculates a rotation matrix from equator of date (EQD) to true ecliptic of date (ECT).

Usage

astro_rotation_EQD_ECT(time)

Arguments

time

A POSIXct object representing the date and time of the equator/ecliptic conversion.

Value

A rotation matrix that converts EQD to ECT.

Details

This is one of the family of functions that returns a rotation matrix for converting from one orientation to another.

Source: EQD = equator of date.

Target: ECT = true ecliptic of date.

Examples

astro_rotation_EQD_ECT(Sys.time())
#>      [,1]      [,2]       [,3]
#> [1,]    1 0.0000000  0.0000000
#> [2,]    0 0.9174887 -0.3977619
#> [3,]    0 0.3977619  0.9174887