20. Pytheas

Southern part of Mare Imbrium, partly surrounded by the Carpathians, (see also chart 31). A complicated structure of bright rays originating in the crater Copernicus crosses this area. We also see a chain of craters, (starting with Statium M, right lower side of the chart) and a ghost crater Lambert R, only visible near the terminator when the sun is low over the local moon horizon.

MONTES CARPATUS - The Carpathians. Named so by Mädler. Designation for the mountains on the southern edge of Mare Imbrium.

Montes. (Length: 361km /224Mi) (Height max: 2400m /7,300ft  ) (14.5° N, 24.4° W) The east-west running mountain ridge is approximately 360 km long, consisting of mountains, mountain massifs, and deep valleys. The highest ranges from 1,,000 to 2,400 meters (see also Charts 19 and 21).

DRAPER - Henry Draper. (Born: Prince Edward County, U. S. A. 1837- Died: New York, U. S. A. 1882) American Astronomer. Worked on astrophotography and spectroscopy. Author of the "Henry Draper Catalogue" containing 240,000 stellar spectra. Inventor of the system of stellar classification.

Crater. (9Km /5Mi ø ) (Dept: 1,740m /5,300ft) (17.6° N, 21.7° W) Isolated circular formation with bowl shape situated at the end of a wrinkle ridge connecting it to Pytheas. Forms a pair with Draper C. Steep slopes,  high walls, round floor.

EULER -   Leonhard Euler. (Born: Basel, Switzerland in 1707 - Died: Saint Petersburg, Russia in 1783) Swiss Mathematician and physicist. Author of 900 works on many areas, amongst them mathematics and astronomy. Author of a "Complete mechanics treaty" in 1736 and "On the theory of the Moon".

Crater. (29Km /17Mi ø ) (Dept: 2,240m / 6,800ft) (23.3° N, 29.2° W) Isolated circular formation. Very steep slopes, high walls with terraces. Extensive and flat floor. Central mountain.

MARE IMBRIUM -  Sea of Rains. Named by Giovanni Battista Riccioli in 1651.

Mare (1,145km /711Mi ø ) (32.8°N, 15.6°W) (830,000 km² ) Second largest lunar sea. Very flat floor with numerous wrinkle ridges at the periphery. Contains the 1st discovered Mascon.

MONS LA HIRE -  Philippe de la Hire. (1640 - 1718) French mathematician and astronomer.

 Mons (25km /15Mi ø ) (Height: 1,500m / 4.921 ft) (27.8° N, 25.5° W) Solitary lunar mountain in the western Mare Imbrium. It is located to the northeast of the crater Euler, and to the west-northwest of Lambert. The mountain base has a shape roughly like an arrow head, with the point oriented toward the west-northwest.

LAMBERT - Johann Heinrich Lambert. (Born: Mulhouse, Germany in 1728 - Died: Berlin in 1777) German Mathematician. Geometrical theories on the orbits of comets. Inventor of the cartographic projection with his name. Discoverer of the irrationality of Pi. Works on photometry.

Crater. (31Km /18Mi ø ) (Dept: 2,690m /8,200ft) (25.6° N, 21.0° W) Isolated circular formation. Steep slopes supporting the craterlet Lambert A to the North-West and large ghost crater Lambert R to the South. High walls with terraces. Battered floor. Central mountain with craterlet to the summit. Craterlets.

20.