astro_make_time

Given a UTC calendar date and time, calculates a POSIXct value that can
be passed to other Astronomy Engine functions for performing various
calculations relating to that date and time.

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_make_time function

<dl><dt>year</dt>
<dd>Integer UTC calendar year (e.g. 2025).</dd>
<dt>month</dt>
<dd>Integer UTC calendar month in the range 1–12.</dd>
<dt>day</dt>
<dd>Integer UTC calendar day in the range 1–31.</dd>
<dt>hour</dt>
<dd>Integer UTC hour of the day in the range 0–23. Default 0.</dd>
<dt>minute</dt>
<dd>Integer UTC minute in the range 0–59. Default 0.</dd>
<dt>second</dt>
<dd>Numeric UTC floating-point second in the range [0, 60).
Default 0.</dd></dl>

Arguments

Create an astronomical time value — astro_make_time

<dl>

<dt>year</dt>
<dd>Integer UTC calendar year (e.g. 2025).</dd>


<dt>month</dt>
<dd>Integer UTC calendar month in the range 1–12.</dd>


<dt>day</dt>
<dd>Integer UTC calendar day in the range 1–31.</dd>


<dt>hour</dt>
<dd>Integer UTC hour of the day in the range 0–23. Default 0.</dd>


<dt>minute</dt>
<dd>Integer UTC minute in the range 0–59. Default 0.</dd>


<dt>second</dt>
<dd>Numeric UTC floating-point second in the range [0, 60).
Default 0.</dd>

</dl>

astro_make_time: Create an astronomical time value

Description

Usage

Value

Arguments

Details

Examples