astro_rotation_HOR_EQD

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

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_rotation_HOR_EQD function

<dl><dt>time</dt>
<dd>A POSIXct object representing the date and time at which the Earth's
equator applies.</dd>
<dt>latitude</dt>
<dd>The observer's geographic latitude in degrees.</dd>
<dt>longitude</dt>
<dd>The observer's geographic longitude in degrees.</dd>
<dt>height</dt>
<dd>The observer's elevation above sea level in meters.</dd></dl>

Arguments

Rotation Matrix from HOR to EQD — astro_rotation_HOR_EQD

<dl>

<dt>time</dt>
<dd>A POSIXct object representing the date and time at which the Earth's
equator applies.</dd>


<dt>latitude</dt>
<dd>The observer's geographic latitude in degrees.</dd>


<dt>longitude</dt>
<dd>The observer's geographic longitude in degrees.</dd>


<dt>height</dt>
<dd>The observer's elevation above sea level in meters.</dd>

</dl>

astro_rotation_HOR_EQD: Rotation Matrix from HOR to EQD

Description

Usage

Value

Arguments

Details

Examples