Whatever your altitude, and the atmospheric pressure on a specific day, this method will let you find the true boiling point, and by using reverse engineering, you will find all the other parameters thet apply to your process.
Fill a pot with water, place it on a burner and bring to a full boil.
Place the probe of a digital thermometer in the boiling water, and note the temperature.
This referenc boiling point, is applicable to your exact location and atmospheric pressure.
To find the boiling point of the Ethanol: Multiply the reference boiling point by: 0.81556
To find the boiling point of the Azeotrope: Multiply the reference boiling point by: 0.81415