astro_ecliptic

Converts equatorial coordinates in the J2000 frame (mean equator of Earth at noon UTC
on 1 January 2000) to true ecliptic coordinates of date (relative to the plane of
Earth's orbit on the given date).

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 function

<dl><dt>x</dt>
<dd>X coordinate in AU.</dd>
<dt>y</dt>
<dd>Y coordinate in AU.</dd>
<dt>z</dt>
<dd>Z coordinate in AU.</dd>
<dt>time</dt>
<dd>A POSIXct time value.</dd></dl>

Arguments

Convert J2000 equatorial coordinates to ecliptic coordinates — astro_ecliptic

<dl>

<dt>x</dt>
<dd>X coordinate in AU.</dd>


<dt>y</dt>
<dd>Y coordinate in AU.</dd>


<dt>z</dt>
<dd>Z coordinate in AU.</dd>


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

</dl>

astro_ecliptic: Convert J2000 equatorial coordinates to ecliptic coordinates

Description

Usage

Value

Arguments

Examples