ASTRONOMY
What Alexandrian scholar wrote a complete treatise on astronomy?
1558.
Whose catalogue gave the positions of 1,088 stars? 128.
With what astronomer does Uie modern science begin? 128.
How did he regard the sun in connection with the solar system? 128, 451.
How had the Greeks considered this? 128, 451.
What two phenomena of gravity and light made it almost certain that the earth is in rotation? 128.
Who discovered these phenomena? 128.
What discovery of Newton's practically completed the proof of the Copernican theory? 128
In the seventeenth century, what invention gave a great impulse to astronomical study? 128.
What has caused the advancement in our knowledge of the solar and stellar systems? 128.
What science has proved of the greatest aid in astronomical investigation? 1476.
What are the four main branches of astronomy? 128.
What does general astronomy include? 128.
What does mathematical astronomy deal with? 128.
What work comes under the head of practical astronomy? 128.
What is meant by astrophysics? 128.
What are the fundamental instruments required? 128.
What is the difference between an observatory and a laboratory? 1369.
What telescopes are the finest in the world? 1885.
Where is the famous Yerkes observatory? 1369.
Who invented the telescope? 1885.
What sort of a glass was Galileo's telescope? 1885.
What is the twofold purpose of the telescope? 1885.
Why do we regard the sun as the most important of the fixed stars? 128, 1848.
How far distant is the sun from the earth? 1848.
If a child had an arm long enough to reach the sun, how old would he be before he felt the burn? 1848.
What is the diameter of the sun? 1848.
Why would the weight of an ordinary man increase so at the sun's surface that he would not be able to stand erect? 1848.
How do the spots on the sun determine the period of the sun's rotation? 1848.
Why is it probable that at some time the earth was split off from the sun? 1848.
What is the photosphere? 1848.
What is the chromosphere? 1848.
What is the corona? 1848.
What produces the twilight? 1848.
THE PLANETS.
How do the planets differ from the stars? 128, 1499.
How many planets are there? 128.
How many were known to the ancients? 1499.
How was the prediction concerning Neptune fulfilled? 1499.
Which planet is nearest the sun? 1500.
Which planet is farthest from the sun? 1500.
Which planet most nearly resembles the earth? 1500.
Why are the transits of Venus important? 1935.
Which planet has two satellites? 1500.
Which is the largest of the planets? 1500.
Which planet has five satellites? 1500.
Which planet has a system of rings and eight satellites? 1500.
Which planet has four satellites? 1500.
THE EARTH.
What is the distance of the earth from the sun? 573.
What did the ancients believe concerning the earth? 573.
