`α``=`					`R=`		`l_0=`
`QD坐标`		`JD坐标`		`JD里程`		`待求点`
`X`	`Y`	`X`	`Y`						`坐标结果`
									`X`	`Y`
`β_0=l_0/(2R)*(180°)/π=`				里 程	`K_(ZH)=K_(JD)-T=`
`m=l_0/2-l_0^3/(240R^2)=`					`K_(HY)=K_(ZH)+l_0=`
`p=l_0^2/(24R)-l_0^4/(2688R^3)=`					`K_(QZ)=K_(ZH)+L/2=`
`T=(R+p)*tan(α/2)+m=`					`K_(YH)=K_(ZH)+L-l_0=`
`E_0=(R+p)*sec(α/2)-R=`					`K_(HZ)=K_(ZH)+l_0=`
`L=R*α*π/(180°)+l_0=`				检 核	`K_(HZ)=K_(JD)+T-q=`
`q=2T-L=`
`A_1=arctan((Y_(JD)-Y_(QD))/(X_(JD)-X_(QD)))=`				`A_2=A_1±α=`
`A_(JY)=A_2±(90-α/2)=`				`A_0=A_1±-90=`
`YX`		`X=X_(JD)+(R+E)*cos(A_2±(90-α/2))=`
		`Y=Y_(JD)+(R+E)*sin(A_2±(90-α/2))=`
`ZH`		`X=X_(YX)+sqrt((R+p)^2+m^2)*cos(A_0±-tan^-1(m/(R+p)))=`
		`Y=Y_(YX)+sqrt((R+p)^2+m^2)*sin(A_0±-tan^-1(m/(R+p)))=`
`HY`		`X=X_(YX)+R*cos(A_0±β_0)=`
		`Y=Y_(YX)+R*sin(A_0±β_0)=`
`QZ`		`X=X_(YX)+R*cos(A_0±α/2)=`
		`Y=Y_(YX)+R*sin(A_0±α/2)=`
`YH`		`X=X_(YX)+R*cos(A_0±(α-β_0))=`
		`Y=Y_(YX)+R*sin(A_0±(α-β_0))=`
`HZ`		`X=X_(YX)+sqrt((R+p)^2+m^2)*cos(A_0±(α+tan^-1(m/(R+p))))=`
		`Y=Y_(YX)+sqrt((R+p)^2+m^2)*sin(A_0±(α+tan^-1(m/(R+p))))=`
		`X=X_(ZH)+(l-l^5/(90R^2l_0^2))*cos(A_1±l^2/(6Rl_0)*(180°)/π)=`
`l=K-K_(ZH)=`		`Y=Y_(ZH)+(l-l^5/(90R^2l_0^2))*sin(A_1±l^2/(6Rl_0)*(180°)/π)=`
		`X=X_(YX)+R*cos(A_0±β_0±l/R*(180°)/π)=`
`l=K-K_(HY)=`		`Y=Y_(YX)+R*sin(A_0±β_0±l/R*(180°)/π)=`
		`X=X_(HZ)+(l-l^5/(90R^2l_0^2))*cos(A_2+180°±-l^2/(6Rl_0)*(180°)/π)=`
`l=K_(HZ)-K=`		`Y=Y_(HZ)+(l-l^5/(90R^2l_0^2))*sin(A_2+180°±-l^2/(6Rl_0)*(180°)/π)=`