[Illustration: =DIAGRAM SHOWING RELATIVE ORBITS OF THE PLANETS AROUND
THE SUN=
1. Crowded group of stars seen in the constellation Hercules.
2. Beautiful circular group of stars in Aquarius. Very brilliant
toward the center.
3-4. Fan-shaped groups of stars, frequently to be observed.
5. Round nebula of Ursa Major.
6. A fine star in Gemini with a great, oval atmosphere.
7. Star in Leo Major in the middle of nebula with very pointed
ends.
8-9. Nebulæ with luminous trains like the tail of a comet.
10. Two stars in Canes Venatici joined by elliptical nebula.
11. Elliptical nebula in Sagittarius with a star in each of the
foci.
12-13. Round nebula in Auriga with three stars in a triangle.
14. Great nebula in Andromeda.
15. Comet of 1819, of remarkable size.
16-17. Great comet of 1811.
18. Surface of the planet Mars, showing the supposed continents and
seas.
19. Disk of the great planet Jupiter with its dark streaks and
masses.
20. The wonderful planet Saturn with its remarkable rings.
=Explanation of Figures in Diagram=
=Rate at which the Planets Travel=]