| Planets. | Years. | Days. | Hours. | Min. | Sec. | Duration of the Moon’s revolution round the Earth. |
| Mercury, | — | 87 | 23 | 15 | 44 | 27 days, 7 hours, 43 minutes, and 12 seconds. |
| Venus, | — | 224 | 16 | 49 | 10 | |
| Earth, | 1 | — | 6 | 9 | 8 | |
| Mars, | 1 | 321 | 22 | 18 | 31 | |
| Vesta, | 3 | 225 | — | — | — | |
| Juno, | 4 | 131 | 10 | 30 | — | |
| Ceres, | 4 | 220 | 13 | 4 | — | |
| Pallas, | 4 | 221 | 15 | 35 | — | |
| Jupiter, | 11 | 314 | 20 | 39 | — | |
| Saturn, | 29 | 166 | 2 | — | — | |
| Herschel, | 83 | 266 | 9 | — | — |
TABLE III.
Showing the Extent and Population of the five great Continents.
| Names of the Continents. | Extent in Sq. Miles. | Population. |
| America, | 14,868,000 | 40,000,000 |
| Europe, | 3,292,000 | 198,000,000 |
| Asia, | 15,000,000 | 500,000,000 |
| Africa, | 11,267,900 | 150,000,000 |
| Australia, | 3,823,200 | 1,500,000 |
| The United States, | 1,781,926 | 13,000,000 |
POPULAR
LESSONS IN ASTRONOMY,
ON A NEW PLAN;
IN WHICH
SOME OF THE LEADING PRINCIPLES OF THE SCIENCE ARE ILLUSTRATED
BY ACTUAL COMPARISONS, INDEPENDENT OF THE
USE OF NUMBERS.
BY FRANCIS J. GRUND,
AUTHOR OF “AN ELEMENTARY TREATISE ON PLANE AND SOLID GEOMETRY,” “ELEMENTS OF NATURAL PHILOSOPHY AND CHEMISTRY,” &c. &c.
BOSTON:
CARTER, HENDEE, AND CO.
1833.