1

5. What is a true solar day? def. 56, p. 12,
6. What is an artificial day? def. 59. p. 13.
7. What is a civil day? def. 60, p. 13.

8. What is a siderial day? def. 61, p. 13.

9. What is meant by apparent noon, or apparent time? def. 53, p. 12.

10. What is true or mean noon? def. 54. p. 12. 11. What is the equation of time at noon? def. 55, p. 12.

XI. Astronomical and miscellaneous definitions, e.

1. What do you understand by the precession of the equinoxes, and in what time do they make an entire revolution round the equinoctial? def. 64, p. 15.

2. What is the crepusculum or twilight, and what is the cause of it? def. 84, p. 20.

3. What is refraction, and whence does it arise? def. 85, p. 20.

4. What is an angle of position, and in what does it differ from a bearing by the mariner's compass? def. 86, p. 21, and note p. 179.

5. What are rhumbs and rhumb-lines? def. 87, p. 21. 6. What are the planets, and how many belong to the solar system? defs. 94 and 95, p. 36.

7. What is the distinction between primary and sec. ondary planets, and how many secondary planets belong to the solar system? def. 96, p. 34.

8. What is the orbit of a planet? def. 97, p. 35; of what figure are the orbits of the planets, and in what part of the figure is the sun placed? p. 129.

9. What are the nodes of a planet? def. 98, p. 35. 10. What are the different aspects of the planets, and how many are there? def. 99, p. 35.

11. What are the syzygies and quadratures of the moon?

12. When is a planet's motion said to be direct, sta tionary, or retrograde? defs. 100, 101, and 102, p. 35. 13. What is a digit? def. 103, p. 36.

14. What is the disc of the sun or moon? def. 104,

p. 36.

15. What are the geocentric and heliocentric latitudes and longitudes of the planets? defs. 105 and 106, p. 36.

16. When is a planet said to be in apogee? def. 107, p. 36.

17. When is a planet said to be in perigee? def. 108. P. 36.

18. What is the aphelion or higher apsis of a planet's orbit? def. 109, p. 36.

19. What is the perihelion or lower apsis of a planet's orbit? def. 110, p. 36.

20. What is the line of the apsides? def. 111, p. 36. 21. What is the eccentricity of the orbit of a planet? def. 112, p. 36.

22. What is the elongation of a planet? def. 117, p. 37.

23. What are the occultation and transit of a planet? defs. 113 and 114, p. 36.

24. What is the cause of an eclipse of the sun? def. 115, p. 36.

25. What is the cause of an eclipse of the moon? def. 116, p. 36.

26. What are the nocturnal and diurnal arches described by the heavenly bodies? defs. 119 and 118, p. 37.

27. What is the aberration of a star? def. 120, p. 37.

28. What are the centripetal and centrifugal forces? defs. 121, and 122, p. 37.

29. What is gravity? def. 8, p. 43.

30. What is the vis inertia of a body? def. 9, p. 43. $1. What are the general properties of matter? p. 42. 32. Can matter be divided ad infinitum? p. 42

and 43.

33. What is motion, and what is the distinction between absolute and relative motion? p. 44.

34. What are Sir I. Newton's three laws of motion? p. 44 and 45.

35. What is compound motion? p. 45.

XII. The solar system and the sun.

1. What is the solar system, and why is it so called? p. 124.

2. What part of the solar system is called the centre of the world? p. 125.

3 Does not the sun revolve on its axis, and what other motion has it?

4. Of what shape is the sun, how far is it from the earth, and what are its diameter and magnitude?

5. What is the comparative magnitude between the sun and the earth? p. 126.

XIII. Of Mercury.

1. What is the length of Mercury's year? p. 127. 2. What is the greatest elongation of Mercury? 3. What is the distance of Mercury from the sun? 4. What is the diameter of Mercury? 128. 5. What is the comparative magnitude between Mercury and the earth?

6. What is the comparison between the light and heat which Mercury receives from the sun, and the light and heat which the earth receives?

7. At what rate per hour are the inhabitants of Mercury (if any) carried round the sun? p. 128 and 129.

XIV. Of Venus.

1. When is Venus an evening star, and in what situation is she a morning star? p. 129.

2. How long is Venus a morning star? p. 129.

3. In how many days does Venus revolve round the

sun?

4. The last transit of Venus over the sun's disc happened in 1769, when will the next transit happen?

5. What is the opinion of Dr. Herschel respecting the mountains in Venus?

6. What is the opinion of M. Schroeter on the same subject? p. 139, in the note.

7. What is the greatest elongation of Venus? p. 130.

8. What is the diameter of Venus? p. 130.

9. What is the magnitude of Venus?

10. What is the distance of Venus from the sun? 11. What is the comparison between the light and heat which Venus receives from the sun, and the light and heat which the earth receives?

12. At what rate per hour does Venus move round the sun?

XV. Of the Earth..

1. What is the figure of the earth? p. 51.

2 Why is the earth represented by a globe? p. 57. 3. What proofs have we that the earth is globular? p. 52 and 53.

4. What would be the elevation of Chimboraco, the highest of the Andes mountains, on an artificial globe of 18 inches diameter? p. 53.

5. What is a spheroid, and how is it generated?

6. What is the difference between the polar and equatorial diameters of the earth? p. 54.

7. What is the length of a degree?

8. What is the use of finding the length of a degree, and how can the magnitude of the earth be determined thereby? p. 55.

9. Who was the first person who measured the length of a degree with tolerable accuracy?

10. What is the length of a degree according to the French admeasurement? note, p. 56.

11 In what time does the earth revolve on its axis from west to east? p. 58.

12. What is the diameter of the earth; what is its circumference, and how are they determined? p. 56, and note.

13 What proofs can you give of the diurnal motion of the earth? p. 58.

14. How do you explain the phenomena of the apparent diurnal motion of the sun? p. 59.

15. What proofs can you give of the annual motion of the earth? p. 60.

16. What is the distance of the earth from the sun, and how is it calculated? p. 61, and note.

17. At what rate per hour does the earth travel round the sun?

18. At what rate per hour are the inhabitants of the equator carried from west to east by the revolution of the earth on its axis? p. 62.

19. How do you explain the motion of the earth round the sun? p. 64.

20. How do you illustrate the phenomena of the different seasons of the year? p. 64.

XVI. Of the Moon.

1. How many kinds of lunar months are there? p. 132.

2. What is a periodical month?

3. What is a synodical month?

4. When is the eccentricity of the moon's elliptical orbit the greatest? p. 132.

5. When is the eccentricity of the moon's elliptical orbit the least? p. 133.

6. Whether does the motion of the moon's nodes follow, or recede from the order of the signs?

7. In how many years do the moon's nodes form a complete revolution round the ecliptic?

8. In what space of time does the moon turn on her axis?

9. What is the libration of the moon? p. 133.

10. Is the path of the moon convex, or concave towards the sun?

11. Please to explain the different phases of the moon? p. 134 and 135.

12. What point on the earth has a fortnight's moon→ light and a fortnight's darkness, alternately? p. 136,

and 197.

13. What is the moon's mean horizontal parallax, and at what distance is she from the earth? p. 136. 14. What is the magnitude of the moon when com→ pared with that of the earth?

15. How many miles is the moon in diameter?

16. In how many days does the moon perform her revolution round the earth, and at what rate does she travel per hour?