Telling Time and Time Zones

Matteo Scotto

9/26/19

Time Zone - a region of the globe that observes a uniform standard time for legal, commercial, and social purposes.

Coordinated Universal Time (UTC) - the primary time standard by which the world regulates clocks and time.

Greenwich Mean Time (GMT) - the local civil time at the former site of the Royal Observatory in Greenwich, England, which is located on the prime meridian.

Daylight Saving Time (DST) - the practice of setting the clocks forward one hour from standard time during the summer months, and back again in the fall, in order to make better use of natural daylight.

Standard Deviation - the average distance between each value and the mean.

Geographers use this step by step process to calculate standard deviation off of time at UTC. Calculate the mean or average of each data set. To do this, add up all the numbers in a data set and divide by the total number of pieces of data. For example, if you have four numbers in a data set, divide the sum by four. This is the mean of the data set. Subtract the deviance of each piece of data by subtracting the mean from each number. Note that the variance for each piece of data may be a positive or negative number. Square each of the deviations. Add up all of the squared deviations. Divide this number by one less than the number of items in the data set. For example, if you had four numbers, divide by three. Calculate the square root of the resulting value. This is the sample standard deviation.