...Teneriffe, and Vienna, on the '15th of April, the 4th of July, and the 20th of November? * PROBLEM X. — To find the length of the day and night at any time of the year. Rule. — Double the time of the sun's rising, which gives the length of the night : double the time...
...Teneriffe, and Vienna, on the loth of April, the 4th of July, and the 20th of November ?f PROBLEM X—To find the length of the day and night at any time of the year. Ex.—Thus, on the 25th of May, the sun rises at London about 4 am, and sets at 8 pm The length of...
PROBLEM X. — To find the Length of the Day and Night at any Time of the Year. 
