Circular Measure.

60 seconds = 1 minute.

60 minutes = 1 degree.

360 degrees = 1 circle.

English Money.

4 farthings = 1 penny.

12 pennies = 1 shilling.

20 shillings = 1 pound.

21  shillings = 1 guinea.

Surveyors' Linear Measure.

7.92 inches                     = 1 link.

25 links                       = 1 rod.

100 links or four rods = 1 chain.

80 chains                    = 1 mile.

Paper Measure

24 sheets = 1 quire.

20 quires = 1 ream.

2 reams = 1 bundle.

5 bundles = 1 bale.

Notes:

The chain (ch.), used by surveyors is called Gunter's chain, and consists of 100 links (l.). Its length is 792 inches, equal to 66 feet, or 4 rods. Its divisions are decimal, so that chains and links may be written as one number in the same manner as dollars and cents,

Thus, since 35 links equal .35 of a chain, 35 links is written 25.35 chains.

Any year the number of which is exactly divisible by 4, but not by 100, is a leap year. When the number is divisible exactly by 400 it is also a leap year.

The solar or tropical year has a length of 365 days, 5 hours, 48 minutes, 49.7 seconds.