A beginner's star-book; an easy guide to the stars and to the astronomical uses of the opera-glass, the field-glass and the telescope . rs the floor, and the brilliant inner slopeof the east wall with the little crater on its crest is fully illuminated. Almost on adirect line between Nos. 20 and 19 lies No. 38, Burg—only 28 miles in diameter butwith a brilliant interior mountain. The two other small, sharply defihed ring-plainsabove and to the left of Burg are Mason and Grove. To the right of Mason, in dulleroutline, is Plana. On the very border of the Sea of Serenity (E) lies the superb walle
A beginner's star-book; an easy guide to the stars and to the astronomical uses of the opera-glass, the field-glass and the telescope . rs the floor, and the brilliant inner slopeof the east wall with the little crater on its crest is fully illuminated. Almost on adirect line between Nos. 20 and 19 lies No. 38, Burg—only 28 miles in diameter butwith a brilliant interior mountain. The two other small, sharply defihed ring-plainsabove and to the left of Burg are Mason and Grove. To the right of Mason, in dulleroutline, is Plana. On the very border of the Sea of Serenity (E) lies the superb walledplain Posidonius, No. 22,—often better lighted in the six-day moon than in this photo-graph,—and next to it, Chacornac, No. 2Ti. Posidonius is one of the finest of lunar objects,for while its walls are only about 6000 feet high, its central crater rises from a brilliantfloor on which, with a good instrument, one may find the remains of an older No. 24 and No. 25, Pliny and Vitruvius, seems to flow the broad strait whichunites the Sea of Serenity (E) with the Sea of Tranquillity (D). Pliny is 32 miles in di-. KEY-MAP TO MOON, AT SIX DAYS See accompanying text, with illustration opposite Zbc flDoon in tbe telescope 75 ameter, Vitruvius 19. The small ring-plains, Kant (26) and Maedler (27), lie to the eastand west respectively of Theophilus, No. 30. Theophilus, 30; Cyrillus, 31; and Catharina, 32;—this triple group forms one of thereally magnificent spectacles of the moon. When the moon is 5}^ to 7^2 days old, or when 18 to 20 days old, theymay be clearly distinguishedeven by a small spy-glass orfield-glass, if the glass besteadily held. Of these greatring-mountains Catharina islargest in area, its diameterbeing over 70 miles fromN. to S. Cyrillus is chieflymarked by the narrow passwhich opens outward towardCatharina. Theophilus isthe deepest of the three—probably the deepest on themoon—being enclosed by arampart which rises at onepoint to 18,000 feet.
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Keywords: ., bookcentury1900, bookdecade19, booksubjectastronomy, bookyear1912
