6007. Measure of Time

6007. Measure of Time.

The year of 365 days is divided into 12 calendar months, 7 of which have 31 days; 4 have 30 days; and 1, February, 28 days. The solar year consists of 365 days, 5 hours, 48 minutes, and 49 seconds; this excess over 365 days, nearly 6 hours, or 1/4 day, is allowed to accumulate through each 4 years, and provided for every fourth, or leap year, by adding 1 day to February; but as this is adding a trifle too much, every 400 years one leap year is omitted, and this occurs when the year is divisible by 400 without remainder.

In the year 1582, tho fact was observed by Pope Gregory XIII that, in consequence of this discrepancy not having been taken into account since the commencement of tho Julian system (see No. 6064 (Roman Division of Time)), the true time exceeded the time as then reckoned by 10 days; and therefore ordered the 11th of March to be accounted the 21st. The Pope's edict was generally observed by the nations subject to his authority, but tho Protestant countries continued the use of the Julian reckoning. This gave rise to the two modes of computation still found in Europe, called the old style and new style. The latter was adopted in England in 1752, by making the 1st of September the 12th.

Whenever tho date of the year is divisible by 4 without remainder, February has 29 days, and that year is called Bissextile.

6008. Table Showing the Number of Days from any Date in One Month to the Same Date in any Other Month

6008. Table Showing the Number of Days from any Date in One Month to the Same Date in any Other Month.

Example: How many days from the 2d of February to the 2d of August? Look for February at the left hand, and August at the top, in the angle is 181. In leap year, add one day if February be included.

6009. Table Showing Difference of Time at 12 o'Clock (Noon) at New York

6009. Table Showing Difference of Time at 12 o'Clock (Noon) at New York.

New York......12.00 n.

Buffalo.........11.40 a. m.

Cincinnati......11.18 "

Chicago.........11.07 "

St. Louis.......10.55 "

San Francisco.. 8.45 " New Orleans... 10.56 "

Washington___11.48 "

Charleston.....11.36 ••

Havana........11.26 ••

Boston.........12.12P. m.

Quebec.........12.12 "

Portland.......12.15 "

London........4.55 "

Paris........... 6.05 "

Rome..........6.45 "

Constantinople. 6.41 "

Vienna......... 6.00 "

St. Petersburg.. 6.57 " Pekin, night.. .12.40 a. m.

6010. Geographical or Nautical Measure

6010. Geographical or Nautical Measure.

Great Circle. Degrees. Leagues. Geo. Miles. 1 = 360 = 7200 = 21600 1 = 20 =        60