Rotation Matrix from HOR to EQD — astro_rotation_HOR

Calculates a rotation matrix from horizontal (HOR) to equatorial of-date (EQD).

Usage

astro_rotation_HOR_EQD(time, latitude, longitude, height)

Arguments

time: A POSIXct object representing the date and time at which the Earth's equator applies.
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 EQD.

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: EQD = equatorial system, using equator of the specified date/time.

Examples

astro_rotation_HOR_EQD(Sys.time(), latitude = -35.28, longitude = 149.12, height = 0)
#>            [,1]      [,2]       [,3]
#> [1,] -0.3012082 0.4928122  0.8163393
#> [2,]  0.8532470 0.5215069  0.0000000
#> [3,] -0.4257266 0.6965391 -0.5775727