Rotation Matrix from HOR to ECL

Calculates a rotation matrix from horizontal (HOR) to J2000 mean ecliptic (ECL).

Usage

astro_rotation_HOR_ECL(time, latitude, longitude, height)

Arguments

time

A POSIXct object representing the date and time of observation.

latitude

The observer's geographic latitude in degrees.

longitude

The observer's geographic longitude in degrees.

height

The observer's elevation above sea level in meters.

Value

A rotation matrix that converts HOR to ECL.

Details

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

Source: HOR = horizontal system (x = north, y = west, z = zenith).

Target: ECL = ecliptic system, using equator at J2000 epoch.

Examples

astro_rotation_HOR_ECL(Sys.time(), latitude = -35.28, longitude = 149.12, height = 0)
#>            [,1]      [,2]       [,3]
#> [1,] -0.2962162 0.7788078  0.5529144
#> [2,]  0.8562993 0.4729796 -0.2074652
#> [3,] -0.4230928 0.4120056 -0.8069968