R: Convert a POSIXt time to a sidereal time

siderealTime {oce} | R Documentation

## Convert a POSIXt time to a sidereal time

### Description

Convert a POSIXt time to a sidereal time, using the method in Chapter 7 of reference 1. The small correction that he discusses after his equation 7.1 is not applied here.

### Usage

    siderealTime(t)

### Arguments

`t` | a time, in POSIXt format, e.g. as created by `as.POSIXct()`, `as.POSIXlt()`, or `numberAsPOSIXct()`. If this is provided, the other arguments are ignored.

### Value

A sidereal time, in hours in the range from 0 to 24.

### Author(s)

Dan Kelley

### References

1. Meeus, Jean, 1982. Astronomical formulae for Calculators. Willmann-Bell. Richmond VA, USA. 201 pages

### See Also

Other things related to astronomy: `eclipticalToEquatorial()`, `equatorialToLocalHorizontal()`, `julianCenturyAnomaly()`, `julianDay()`, `moonAngle()`, `sunAngle()`, `sunDeclinationRightAscension()`

### Examples

    t <- ISOdatetime(1978, 11, 13, 0, 0, 0, tz="UTC")
    print(siderealTime(t))

[Package oce version 1.2-0 Index]