Description Usage Arguments Value Note Source
This package will provide tools to visualize the earthquake dataset obtained from the U.S. National Oceanographic and Atmospheric Administration (NOAA) on significant earthquakes around the world. This dataset contains information about 5,933 earthquakes over an approximately 4,000 year time span.
1 | bc_date(ad)
|
ad |
A Date class of mirrored AD date , a positive Date type (e.g. "2001-01-01"). |
A Date class of BC date, a negative Date type (e.g. "-2001-01-01") corresponding to the mirrored AD date
As this is just an internal function to be used for the other functions, it is not exported.
Dataset NOAA Significant Earthquake Database
https://www.ngdc.noaa.gov/nndc/struts/form?t=101650&s=1&d=1
National Geophysical Data Center / World Data Service (NGDC / WDS):
Significant Earthquake Database.
National Geophysical Data Center, NOAA. doi:10.7289 / V5TD9V7K
Get BC date from mirrored AD date: bc_date()
This sub function converts a mirrored AD date to BC date and internally used.
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