R: Astronomical Calculations for Tidem

tidemAstron {oce} | R Documentation

## Astronomical Calculations for Tidem

### Description

Do some astronomical calculations for `tidem()`. This function is based directly on `t_astron` in the `T_TIDE` Matlab package (see Pawlowicz et al. 2002), which inherits from the Fortran code described by Foreman (1978).

### Usage

    tidemAstron(t)

### Arguments

`t` | Either a time in `POSIXct` format (with `"UTC"` timezone, or else odd behaviours may result), or an integer. In the second case, it is converted to a time with `numberAsPOSIXct()`, using `tz="UTC"`.

### Value

A `list` containing items named `astro` and `ader` (see the `T_TIDE` documentation).

### Author(s)

Dan Kelley translated this from the `t_astron` function of the `T_TIDE` Matlab package (see Pawlowicz et al. 2002).

### References

- Foreman, M. G. G., 1978. Manual for Tidal Currents Analysis and Prediction. Pacific Marine Science Report. British Columbia, Canada: Institute of Ocean Sciences, Patricia Bay.

- Pawlowicz, Rich, Bob Beardsley, and Steve Lentz, 2002. Classical tidal harmonic analysis including error estimates in MATLAB using `T_TIDE`. Computers and Geosciences, 28, 929-937.

### See Also

Other things related to tides: `[[,tidem-method`, `[[<-,tidem-method`, `as.tidem()`, `plot,tidem-method`, `predict.tidem()`, `summary,tidem-method`, `tidalCurrent`, `tidedata`, `tidem-class`, `tidemVuf()`, `tidem`, `webtide()`

### Examples

    tidemAstron(as.POSIXct("2008-01-22 18:50:24"))

[Package oce version 1.7-2 Index]