def validate_geography(lon: float, lat: float):
    """
    Verifies that latitude and longitude values are valid
    :param lon: longitude value in degrees
    :param lat: latitude value in degrees
    :return valid: boolean for whether the lon/lat values are valid
    """
    lon_valid = lon >= -180 and lon <= 180
    lat_valid = lat >= -90 and lat <= 90
    valid = lon_valid and lat_valid
    if not valid:
        return False
    else:
        return True