Names
- McDowell, C. S.1
- McGregor, Tracy William, 1869-1936.1
- McMath Solar Telescope.1
- McMath, Francis Charles, 1867-1938.1
- McMath, Robert R. (Robert Raynolds), 1891-19621
- McMath, Robert Raynolds, 1891-1962.1
- McMath-Hulbert Observatory (University of Michigan)1
- Meinel, Aden B.1
- Merrill, Paul W. (Paul Willard), 1887-1
- Merrill, Paul W. (Paul Willard), 1887-1961.1
- Miller, Freeman D. (Freeman Devold), 1909-2000.1
- Miller, Freeman Devold, 1909-1
- Mohler, Orren Cuthbert, 1908-1
- National Science Foundation (U.S.). Advisory Panel for the National Astronomical Observatory.1
- Nicholson, Seth B. (Seth Barnes), 1891-1963.1
- Nicholson, Seth Barnes, 1891-1
- Norton, William J. (William John), 1883-1975.1
- Odegaard, Charles E.1
- Ormondroyd, J. (Jesse), 1897-1
- Petrie, Robert Methven, 1906-1