def sec2year(seconds):
    """
    Convert seconds into decimal Julian years.

    Julian years have 365.25 days.

    Parameters:

    * seconds : float
        Time in seconds

    Returns:

    * years : float
        Time in years

    Example::

        >>> print sec2year(31557600)
        1.0

    """
    return float(seconds) / 31557600.0