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## Main Question or Discussion Point

I need some good pointers to how could I derive arbitrary small circle equation in spherical coordinats (by hand or computer-aided), that is, LONG(t), LAT(t) or something like that.

Also, any approximate equations? How bad they are?

Please do not advice switching to cartesian, this is exactly what I would like to avoid.

Thank you for reading.

PS: if you happened to have ready equations, don't tease me, post'em.

Also, any approximate equations? How bad they are?

Please do not advice switching to cartesian, this is exactly what I would like to avoid.

Thank you for reading.

PS: if you happened to have ready equations, don't tease me, post'em.