Convert Cartesian Vector to Equatorial Coordinates

Given an equatorial vector, calculates equatorial angular coordinates (right ascension and declination).

Given an equatorial vector, calculates equatorial angular coordinates (right ascension and declination).

Usage

astro_equator_from_vector(vector)

astro_equator_from_vector(vector)

Arguments

vector

A list with components:

x

The Cartesian x-coordinate in AU

y

The Cartesian y-coordinate in AU

z

The Cartesian z-coordinate in AU

t

The date and time (POSIXct) at which this vector is valid

Value

A list representing equatorial coordinates with elements:

• ra: Right ascension in sidereal hours (0-24)

• dec: Declination in degrees (-90 to +90)

• dist: Distance in AU

• vec: The original vector

• status: Status code (0 = success)

A list with components:

ra

Right ascension in sidereal hours

dec

Declination in degrees

dist

Distance to the celestial body in AU

vec

Equatorial coordinates in Cartesian vector form

status

Status code (0 = success)

Examples

vec <- list(x = 1, y = 0.5, z = 0.25, t = as.POSIXct("2024-01-01", tz = "UTC"))
equ <- astro_equator_from_vector(vec)

# Convert vector to equatorial coordinates
vec <- list(x = 1, y = 0, z = 0, t = as.POSIXct("2024-01-01", tz = "UTC"))
equ <- astro_equator_from_vector(vec)