Having found the place where the Sun is vertical at the given hour, rectify the globe for that latitude, and bring the said place to the meridian.
Then all those places that are in the Western semicircle of the horizon, have the Sun rising at that time.
Those in the Eastern semicircle have it setting.
To those who live under the upper semicircle of the meridian, it is 12 o’clock at noon. And,
Those who live under the lower semicircle of the meridian, have it at midnight.
All those places that are above the horizon, have the Sun above them, just so much as the places themselves are distant from the horizon; which height may be known by fixing the quadrant of altitude in the zenith, and laying it over any particular place.
In all those places that are 18 degrees below the Western side of the horizon, the twilight is just beginning in the morning, or the day breaks. And in all those places that are 18 degrees below the Eastern side of the horizon, the twilight is ending, and the total darkness beginning.
The twilight is in all those places whose depression below the horizon does not exceed 18 degrees. And,
All those places that are lower than 18 degrees, have dark night.
The depression of any place below the horizon is equal to the altitude of its Antipodes, which may be easily found by the quadrant of altitude.