Mark the point of declination upon the meridian, according as it is either North or South from the equator; then slide the meridian up or down in the notches, ’till the point of declination be so far distant from the horizon, as is the given meridian altitude; that elevation of the Pole will be the latitude. Thus, if the Sun’s, or any Star’s meridian altitude be 50 degrees, and its declination 11½ degrees North, the latitude will be 51½ degrees North. PROB. XXXII. _The Day and Hour of a Lunar Eclipse being known; to find all those Places upon the Globe where the same will be visible._ [5] Find where the Sun is vertical at the given hour, and bring that point to the zenith; then the Eclipse will be visible in all those places that are under the horizon; Or, if you bring the Antipodes to the place where the Sun is vertical, into the zenith, you will have the places where the Eclipse will be visible above the horizon. _Note_, Because _Lunar_ eclipses continue sometimes for a long while together, they may be seen in more places than one hemisphere of the Earth; for by the Earth’s motion round its axis, during the time of the eclipse, the Moon will rise in several places after the eclipse began. _Note_, When an eclipse of the Sun is central, if you bring the place where the Sun is vertical at that time, into the zenith, some part of the eclipse will be visible in most places within the upper hemisphere; but by reason of the short duration of Solar eclipses, and the latitude which the Moon commonly has at that time (tho’ but small) there is no certainty in determining the places where those eclipses will be visible by the globe; but recourse must be had to calculations. PROB. XXXIII. _The Day of the Month, and Hour of the Day, according to our way of reckoning in_ England, _being given; to find thereby the_ Babylonic, Italic, _and the_ Jewish, _or Judaical Hour._ 1. To find the _Babylonic Hour_ (which is the number of hours from Sun-rising.) Having found the time of Sun-rising in the given place, the difference betwixt this and the hour given, is the _Babylonic Hour_. 2. To find the _Italic Hour_ (which is the number of hours from Sun-setting.) Subtract the hour of Sun-setting from the given hour, and the remainder will be the _Italic Hour_ required. 3. To find the _Jewish Hour_ (which is ¹/₁₂ part of an _Artificial Day_.) Find how many hours the day consists of; then say, as the number of hours the day consists of is to 12 hours, so is the hour since Sun-rising to the _Judaical_ hour required. Thus, if the Sun rises at 4 o’clock (consequently sets at 8) and the hour given be 5 in the evening, the _Babylonish_ hour will be the 13th, the _Italic_ the 21st and the _Jewish_ hour will be nine and three quarters. The converse being given, the hour of the day, according to our way of reckoning in _England_, may be easily found.