. Astronomy for students and general readers . edal op the great comet of 1680. Great Comet of 1811. —Fig. 110 shows its general ap-pearance. It has a period of over 3000 years, and itsaphelion distance is about 40,000,000,000 miles. Great Comet of 1843,—One of the most brilliant com-ets which have appeared during the present century wasthat of February, 1843. It was visible in full dayhghtclose to the sun. Considerable terror was caused in somequarters, lest it might presage the end of the world,which had been predicted for that year by Millee. Atperihelion it passed nearer the sun than any o
. Astronomy for students and general readers . edal op the great comet of 1680. Great Comet of 1811. —Fig. 110 shows its general ap-pearance. It has a period of over 3000 years, and itsaphelion distance is about 40,000,000,000 miles. Great Comet of 1843,—One of the most brilliant com-ets which have appeared during the present century wasthat of February, 1843. It was visible in full dayhghtclose to the sun. Considerable terror was caused in somequarters, lest it might presage the end of the world,which had been predicted for that year by Millee. Atperihelion it passed nearer the sun than any other bodyhas ever been known to pass, the least distance being onlyabout one fifth of the suns semi-diameter. With a veryslight change of its original motion, it would have actuallyfallen into the sun. OREAT COMET OF 1858, 407 Great Comet of 1858.—Another remarkable comet forthe length of time it remained visible was that of is frequently called after the name of Donati, its firstdiscoverer. No comet visiting our neighborhood in. Pig. 110—GBEAT COMET OP 1811. recent times has afforded so favorable an opportunity forstudying its physical constitution. Some of the results ofthe observations made upon it have already been presented. Missing Page Missing Page PART III. THE UNIVERSE AT LARGE. INTRODUCTION. In our studies of the heavenly bodies, we have hithertobeen occupied almost entirely with those of the solar sys-tem. Although this system comprises the bodies whichare most important to us, yet they form only an insignifi-cant part of creation. Besides the earth on which wedwell, only seven of the bodies of the solar system areplainly visible to the naked eye, whereas it is well knownthat 2000 stars or more can be seen on any clear now have to describe the visible universe in its largestextent, and in doing so shall, in imagination, step overthe bounds in which we have hitherto confined ourselvesand fly through the immensity of space. The material imivers
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