60

seconds......

1

minute,

60

minutes................

1

degree.

30

degrees................

1

sign.

90

degrees................

1

quadrant.

4

quadrants..............

1 circle.

360

degrees...............

A convenient method of finding the difference in time between two places, is to notice their distance apart in degrees of longitude, and allow 4 minutes to each degree, based on the following

CALCULATION:

1440

minutes............

1 day.

or revolution of the earth.

1

revolution of the earth is

360

degrees; therefore,

1

degree.........4 minutes.