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*fhe Use of the Terrsrial Globe.

Since ali latitudes are reckoned from the equator, and all longitudesare reckoned from the first meridian, it is evident, that the point ofthe equator which is cut by the first meridian, has neither latitude norlongitude.—The greatest latitude is 90 degrees, because no place ismore than 90 degrees from the equator. And the greater longitude is180 degrees, because no place is more than 180 degrees from the firstmeridian.

PROBLEM V.

To find. the * antceci, *j- periceci, and £ antipodes, of any given place .

Bring the given place to the brafen meridian, and having found itslatitude, keep the globe in that situation, and count the fame numberof degrees of latitude from the equator towards the contrary pole, andwhere the reckoning ends, you have the antceci of the given placeupon the globe. Thofe who live at the equator have no antceci.

The globe remaining in the fame position, fet the hour-index to theupper XII on the horary circle, and turn the globe until the indexcomes to the lower XII; tKen, the place which lies under the meri-dian, in the fame latitude with the given place, is th q periceci required.Thofe who live at the poles have no periceci.

As the globe now stands (with the index at the lower XII) theantipodes of the given place will be under the fame point of the brafen

* The antceci are thofe people who live on the fame meridian, and in equal latitudes,on different sides of the equator. Being on the fame meridian, they have the fame hours ;that is,when it is noon to the one, it is also noon to the other; and when it is mid-nightto the one, it is also mid-night to the other, &c. Being on different sides of the equa-tor, they have different or opposite seasons at the fame time; the length of any day tothe one is equal to the length of the night of that day to the other; and they have equalelevations of the different poles.

The periceci are thofe people who live on the fame parallel of latitude, ;but onopposite meridians : so that though their latitude be the fame, their longitude differs180 degrees. By being in the fame latitude, they have equal elevations of the famepole (for the elevation of the pole is always equal to the latitude of the place) thefame length of days or nights, and the fame seasons. 'But being on opposite meridianswhen it is noon to the one, it is mid-night to the other.

J The antipodes are thofe who live diametrically opposite to one another upon theglobe, standing with feet towards feet, on opposite meridians and parallels. Being onopposite sides of the equator, they have opposite seasons, winter to one, when it isfummer to the other; being equally distant from the equator, they have the contrarypoles equally elevated above the horizon ; being on opposite meridians, when it is noondo the one, it must be midnight to the other; and as the sim recedes from the onewhen he approaches to the other, the length of the day to one must be equal to thelength of the night at the fame time to the other.

meridian

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