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26.Cleomedes The north-western part of Mare Crisium is surrounded by mighty mountain ranges. If the light comes in at a low angle we see many ridges crisscrossing the mare. The rays of Proclus reach till here, and when the Sun is high in the local sky, they become very bright for observers on Earth. CLEOMEDES - Cleomedes (1th Century BC) (Κλεoμήδης) Greek astronomer who is known chiefly for his book "On the Circular Motions of the Celestial Bodies".
MARE CRISIUM - Mare Crisium was named in 1651 by astronomers Francesco Grimaldi and Giovanni Battista Riccioli in their lunar map Almagestum novum.
DEBES - Ernst Debes. (1840 -1923) German cartographer. Worked on school atlases, and a Moon atlas.
DELMOTTE - Gabriel Delmotte (1876 - 1950) French selenographer. Author of "Recherches sélénographiques et nouvelle théorie des cirques lunaires".
PROMONTORIUM LAVINIUM - PROMONTORIUM OLIVIUM - Two Capes pointing towards each other, at the western edge of Mare Crisum. (Named by William Birt) Inbetween the two capes, not a Bridge, as was suggested in the past, by amateurs John J O'Neill and H.P.Wilkins, but two craters.
MACROBIUS - Ambrosius Macrobius (4th century AD) Greek/Roman grammarian and author.
PEIRCE - Benjamin Peirce. (1809 - 1880) American astronomer and mathematician.
PICARD - Jean Picard. (1620 - 1682) French astronomer.
PROCLUS - Proclus Lycaeus (Πρόκλος ὁ Διάδοχος) (412 – 485 AD) Greek philosopher. Called: "The Successor" (of Plato).
PALUS SOMNI - Marsh of Sleep. Named by Riccioli.
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 TISSERAND - François Felix Tisserand (1845 - 1896) French astronemer. Author of "Traité de mécanique céleste". Observed the transit of Venus in 1874. And in 1883 held the Chair of celestial mechanics at the Sorbonne University in Paris..
TRALLES - Johann G. Tralles (1763 - 1822) German physicist. Inventor of the alcoholmeter.
YERKES - Charles T.Yerkes. (1837–1905) American millionaire from Chicago. financier of Yerkes Observatory. And at the time the world's biggest refractor.
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