Table of smoothed Delta T values from Morrison and Stephenson, 2004.

def morrison_and_stephenson_2004_table():
    """Table of smoothed Delta T values from Morrison and Stephenson, 2004."""
    import pandas as pd
    f = load.open('http://eclipse.gsfc.nasa.gov/SEcat5/deltat.html')
    tables = pd.read_html(f.read())
    df = tables[0]
    return pd.DataFrame({'year': df[0], 'delta_t': df[1]})