THE CENTENARY OF THE DISCOVERY OF URANUS. 
209 
quence of its motion and tlie faint, and somewhat ill- defined 
character of its appearance. 
From the earliest ages five planets only were known, and 
AURIGA 
*■ 0 
Castor 
*0 
* * 
Pollux 
♦, 
9 ■ * ' 
* GEMINI 
* X 
* A 
l racy on 
CANIS MINOR 
TAURUS 
Uranus * 
* * H 
r 
* *V- 
K 
* 
Bctelyeuse TBeliatrix 
ORION 
;**v 
<r 
6 
* * * * . „ * , 
w Riqd. 
Fig. 1. Approximate place of TJranus amongst the stars at its discovery on 
March 13, 1781. 
the discovery of another large planet beyond the sphere o£ 
baturn must at once revolutionize existing ideas as to the range 
of the solar system, and immediately take rank as a scientific 
event of equal interest to the discovery of the moons of Jupiter 
NEW SERIES, VOL. V. NO. XIX. P 
