astro_rotation_EQJ_ECT

Calculates a rotation matrix from J2000 mean equator (EQJ) to true ecliptic
of date (ECT).

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_EQJ_ECT function

<dl><dt>time_posix</dt>
<dd>A POSIXct object specifying the date and time at which the Earth's equator
defines the target orientation.</dd></dl>

Arguments

Rotation Matrix from EQJ to ECT — astro_rotation_EQJ_ECT

<dl>

<dt>time_posix</dt>
<dd>A POSIXct object specifying the date and time at which the Earth's equator
defines the target orientation.</dd>

</dl>

astro_rotation_EQJ_ECT: Rotation Matrix from EQJ to ECT

Description

Usage

Value

Arguments

Details

Examples