Recreations in Astronomy: With Directions for Practical Experiments and Telescopic Work

ages angle appear astronomers atoms attraction become body bright called cause centre circle color comes comet dark diameter direction discovered discovery distance earth east eight equator fall feet five flame force four give glass half hand heat heavens hence hold hundred hydrogen inch infinite Jupiter known less light look Mars mass matter means measure Mercury meteors miles millions mind minute moon motion mountains move movements nature nearly never night o'clock observed once orbit pass perfect period planet pole possible present Professor rays reach reflected result revolving ring rises satellites Saturn says seen side space speed stars surface telescope theory things thought thousand tion turn universe Uranus Venus vibrations visible whole