Heliocentric ecliptic longitude of a body — astro_ecliptic

Calculates the angle around the ecliptic plane of a celestial body as seen from the center of the Sun. The angle is measured prograde (in the direction of Earth's orbit) in degrees from the true equinox of date, with values in the range [0, 360).

Usage

astro_ecliptic_longitude(body, time)

Arguments

body: Identifier of celestial body (e.g., astro_body[["MARS"]]). Must not be the Sun.
time: A POSIXct time value.

Value

A numeric value with the ecliptic longitude in degrees [0, 360).

Examples

time <- as.POSIXct("2025-02-19 22:10:12", tz = "UTC")
astro_ecliptic_longitude(astro_body[["MARS"]], time)
#> [1] 131.9139