66 Caroline Lucrctia Herschel. [1786. 



By the naked eye the comet is between the 54 and 53 

 Ursee Majoris and the 14, 15, and 16 Comse Berenices, and 

 makes an obtuse triangle with them, the vertex of which 

 is turned towards the south. 



Aug. 2nd, 10 h 9'. The comet is now, with respect to the 

 stars a and b, situated as in Fig. 4, therefore the motion 

 since last night is evident. 



10 h 30'. Another considerable star, c, may be taken into 

 the field with it by placing a in the centre, when the comet 

 and the other star will both appear in the circumference, as 

 in Fig. 5. 



These observations were made with a Newtonian sweeper 

 of 27-inch focal length, and a power of about 20. The 

 field of view is 2 12'. I cannot find the stars a or c in any 

 catalogue, but suppose they may easily be traced in the 

 heavens, whence the situation of the comet, as it was last 

 night at 10 h 33', may be pretty nearly ascertained. 



You will do me the favour of communicating these 

 observations to my brother's astronomical friends. 

 I have the honour to be, 



Sir, 

 Your most obedient, humble servant, 



CAROLINA HERSCHEL. 



August Ind, 1786. 



SLOUGH, NEAR WINDSOR. 



MISS HERSCHEL TO ALEX. AUBERT, ESQ. 



SLOUGH, August 2, 1786. 

 DEAR SIR, 



August 1st, in the evening, at 10 o'clock, I saw an 

 object very much resembling (in colour and brightness) the 

 27 of Mr. Messier's Nebula, except this object being round. 

 I suspected it to be a comet ; but a haziness came on before 

 I could convince myself of its having moved. I made 

 several figures of the objects in the field, whereof I take the 



