Given an object that can be coerced to POSIXlt, return the fraction of a year represented by the object.

## Usage

`yearlyFraction(t, year = 2022, input = "POSIX", unit = "radians")`

## Arguments

- t
Object to be converted to a fraction

- year
Year to calculate fractions of (allows for leap years)

- input
One of POSIXlt (default)

- unit
If set to radians outputs a position around a circle. If set to fraction outputs the raw fraction.