Walter Hohmann (18 March 1880, Hardheim, Germany – 11 March 1945, Essen, Germany) was a German engineer who made an important contribution to the understanding of orbital dynamics. In a book published in 1925, Hohmann demonstrated a very fuel-efficient path to move a spacecraft between two different orbits, now called a Hohmann transfer orbit. He received his Ph.D. from the RWTH Aachen University in 1920.
Read more about Walter Hohmann: Biography, Walter-Hohmann-Observatory
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“Be advised what thou dost discourse of, and what thou maintainest whether touching religion, state, or vanity; for if thou err in the first, thou shalt be accounted profane; if in the second, dangerous; if in the third, indiscreet and foolish.”
—Sir Walter Raleigh (1552–1618)