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.
The following Problems are peculiar to the Celestial Globe.