def dew_point_from_db_rh(db_temp, rh):
es = <NUM_LIT> * math.e**((<NUM_LIT> * db_temp) / (db_temp + <NUM_LIT>))<EOL>e = (es * rh) / <NUM_LIT:100><EOL>td = (<NUM_LIT> * math.log(e / <NUM_LIT>)) / (<NUM_LIT> - math.log(e / <NUM_LIT>))<EOL>return td<EOL>
Dew Point Temperature (C) at Dry Bulb Temperature db_temp (C) and
    Relative Humidity rh (%).

    Note:
        [1] J. Sullivan and L. D. Sanders. "Method for obtaining wet-bulb temperatures by
        modifying the psychrometric formula." Center for Experiment Design and Data
        Analysis. NOAA - National Oceanic and Atmospheric Administration.
        http://www.srh.noaa.gov/epz/?n=wxcalc_rh