Celestial and terrestrial Globes. 131

passing from the sun’s light into the twi-light; whose inhabitants will fee the funletting, and enjoy the twilight, until theyarrive at the wire circle, which is placed18 degrees below the illuminated disc, atwhich time they enter into total darkness.

The graduated fide of the strong brassmeridian shews, at the lame time, all thoseplaces which have mid-day or noon.

If the horary index be set to XII, whenany particular place is brought under thestrong brass meridian, it will shew, as youturn the globe from west to east, the pre-cise time of sun-rising, setting, &c. at thatplace.

The horary index will also shew howlong a place is moving from the west tothe east fide of the illuminated disc, hererepresented by the broad paper circle, andthence the length of the day and night; itwill also point out the length of the twilight,by shewing the time in which the place ispassing from the twilight circle to the edg£of the disc on the western side, or from theedge of the disc to that circle on the easternside; and thereby determining the length of

its whole artificial day.

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