ON THE EQUINOXES. , mi 



A,fu&T>;<.- i ■:-■-„•• ce of theory, though not ©f prt£lice a occurs 

 among the fmdu aftronomers, in ■regard to the curvature of the 

 ■excentrick deferents, and the cenfequent method of computing on the 

 jequivalent hypothecs -of epie^ejkia 



A BtiiEHiHCi to Mr, Ba¥is 9 « effay^ sad t@ Sfee diagrams which ae~ 

 .company it, will render Intelligible what km .been already' faid and 

 what now remakai to be explained* ll m there obferved, that It 

 is only In .computing the retrogradations &ni ©ther particular! ref* 

 peeling 4he .minor planets, .that the Hindus find the length ©f the 

 •Ckrtf&s e ©;t {m line drawn frora the centre of the earth; to the planet's 

 place in.the epicycle ) e In -other cafe& a§ for the Anoraaliftiek j Equa- 

 tion.^ the Sun assd Moon, .they are iatisfied to^take he as equal to ..the 

 $ine /^J (that is # the Sine,$of mean anomaly, reduced to its dimen Eons 

 inthe epicycle -in parts of the . radius, ©f . the eoncentrick, equal to the 

 gincof the .Anomaliftick JEquation). The reafon is fubjoined ; ** The 

 difference, as the commentator on Jhc Sfoya-fidd'hmta ©bferves, being 

 inconiiderablc" 



.Most of the commentators on -the $urya-fidti'hdnta do align that rea- 

 fon; but fome of them adopt Brahmeg-upta's explanation. This 

 ,aftronomer maintains, that the operation of finding the Carna is rightly, 

 omitted in refpeel of the execntricks or equivalent epicycles of all the 

 planets, and retained in regard to the proper epicycles of the minor 

 planets carried by the excentrick deferents. His hypothecs, as briefly 

 intimated by himfelfj and as explained by .Bhascara, fuppofes the 



, * At. Rci. toT. t, p. 249. 



,+ At. Rci, to!. 2. p. 250 Diagram fig. s 



t Ibid. 



M j 



