The further from these cardinal points and the closer to the quadrantal points ( i . e . 45? 135? 225?and 315?from the nose ) the greater the effect, but quadrantal error is normally much less than dip error, which is always present when the aircraft is banked.
12.
:My reading of the section that you link to is that it says a " amphora quadrantal " has a volume of one cubic foot, a " congius " is a half-foot cubed ( i . e . its volume is equal to a cube that is half a foot in each dimension ), and in the table it says that an amphora quadrantal is equal to 8 congii.
13.
:My reading of the section that you link to is that it says a " amphora quadrantal " has a volume of one cubic foot, a " congius " is a half-foot cubed ( i . e . its volume is equal to a cube that is half a foot in each dimension ), and in the table it says that an amphora quadrantal is equal to 8 congii.
14.
In the north pole of the ecliptic is a nut " b ", to which is fixed one end of the quadrantal wire, and to the other end a small sun " Y ", which is carried round the ecliptic " B " " B ", by turning the nut : and in the south pole of the ecliptic is a pin " d ", on which is another quadrantal wire, with a small moon " ? " upon it, which may be moved round by hand : but there is a particular contrivance for causing the moon to move in an orbit which crosses the ecliptic at an angle of 5S ! degrees, to opposite points called the " moon's nodes "; and also for shifting these points backward in the ecliptic, as the " moon's nodes " shift in the heaven.
15.
In the north pole of the ecliptic is a nut " b ", to which is fixed one end of the quadrantal wire, and to the other end a small sun " Y ", which is carried round the ecliptic " B " " B ", by turning the nut : and in the south pole of the ecliptic is a pin " d ", on which is another quadrantal wire, with a small moon " ? " upon it, which may be moved round by hand : but there is a particular contrivance for causing the moon to move in an orbit which crosses the ecliptic at an angle of 5S ! degrees, to opposite points called the " moon's nodes "; and also for shifting these points backward in the ecliptic, as the " moon's nodes " shift in the heaven.
