astro_ecliptic_longitude

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).

Provides access to the 'Astronomy Engine' C library
(<https://github.com/cosinekitty/astronomy>) by Don Cross. The library
calculates positions of the Sun, Moon, and planets, and predicts
astronomical events such as rise/set times, lunar phases, equinoxes,
solstices, eclipses, and transits. It is based on the 'VSOP87' planetary
model and is accurate to within approximately one arcminute. This package
bundles the single-file C source so that other R packages can link against
it via 'LinkingTo' without shipping their own copy.

Mitchell O'Hara-Wild

astronomyengine

R Bindings to the 'Astronomy Engine' C Library

Don Cross

astro_ecliptic_longitude function

<dl><dt>body</dt>
<dd>Identifier of celestial body (e.g., <code>astro_body[["MARS"]]</code>).
Must not be the Sun.</dd>
<dt>time</dt>
<dd>A POSIXct time value.</dd></dl>

Arguments

Heliocentric ecliptic longitude of a body — astro_ecliptic_longitude

<dl>

<dt>body</dt>
<dd>Identifier of celestial body (e.g., <code>astro_body[["MARS"]]</code>).
Must not be the Sun.</dd>


<dt>time</dt>
<dd>A POSIXct time value.</dd>

</dl>

astro_ecliptic_longitude: Heliocentric ecliptic longitude of a body

Description

Usage

Value

Arguments

Examples