Celestial and Ta-rejlrtal Globes. 95

The equinoctial colure only passes throughthe poles of the world at n and s. But,

The solstitial colure passes through thepoles of the world at n and s, and alsothrough the poles of the ecliptic at B and K,fig. 26.

Whence it happens in every daily rota-tion of the earth about its axis, that thesolstitial and equinoctial coloures are twiceblended with every meridian upon the sur-face of the earth : consequently, each poleof the ecliptic appears to pass, once everyday, over all the meridians of the terrestrialsphere.

182. All those circular lines that are,or may be supposed, drawn on. the celestialglobe, which pass through the poles, cuttingthe equator at right angles, are called circlesof declination ; because the declination ofthose points or stars through which theypass, or the distance of those stars from theequator, is measured upon these circles: andthis is done by bringing the divided edge ofthe moveable meridian to any star.

Hence the thin brass femi-circle, art. 1! 5.which we call the moveable meridian, isalso a moveable circle of declination.

Arctic