Rotation Matrix from HOR to ECL — astro_rotation_HOR

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,] 0.4407821  0.6689751  0.5984843
#> [2,] 0.6504442 -0.6975262  0.3006319
#> [3,] 0.6185738  0.2567675 -0.7425880