Walter H. Haas (July 3, 1917 - April 6, 2015) was an American amateur astronomer. He started observing in the 1930s. After the Second World War he founded the Association of Lunar and Planetary Observers (ALPO) Read more
Walter H. Haas (July 3, 1917 - April 6, 2015) was an American amateur astronomer. He started observing in the 1930s. After the Second World War he founded the Association of Lunar and Planetary Observers (ALPO)