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About This Quiz
There are 24 hours in a day but only 12 hours on a watch. Think you have what it takes to correctly identify the time given a single shot of a watch face? Take this quiz now to test your luck!
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What time is shown on this clock?
2:17
1:45
A clock is an instrument to measure, keep, and indicate time. The word clock is derived from the Celtic words clagan and clocca meaning "bell."
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8:15
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What time is shown on this clock?
4:18
10:10
The study of timekeeping is known as horology. A person who studies time is called a horologist.
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What time is shown on this clock?
1:45
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3:30
There are many different instruments used to measure time. They include clocks, watches, clockwork, sundials, hourglasses, clepsydras, timers, time recorders, marine chronometers and atomic clocks.
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What time is shown on this clock?
12:00
7:50
A clepsydra is also known as a water clock. It is a timepiece in which time is measured by the regulated flow of liquid into or out of a vessel where the amount is then measured.
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9:25
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What time is shown on this clock?
1:45
3:45
A sundial is a device that tells the time of day by the apparent position of the Sun in the sky. It is one of the oldest forms of timekeeping.
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What time is shown on this clock?
7:25
4:00
3:15
Chronometry is the science of the measurement of time, or timekeeping. Chronometry applies to electronic devices, while horology refers to mechanical devices.
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What time is shown on this clock?
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4:15
7:46
12:05
An atomic clock is defined as a clock device that uses an electron transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element.
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What time is shown on this clock?
6:30
A watch is a small timepiece intended to be carried or worn by a person. It is designed to keep working despite the motions caused by the person's activities.
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4:18
1:27
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What time is shown on this clock?
5:15
In some cases, wristwatches may be battery operated or motion operated. This means the clock will keep time as long as the person is wearing it.
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10:18
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What time is shown on this clock?
5:16
1:35
Watches evolved in the 17th century from spring-powered clocks. Spring-powered clocks date back to the 14th century!
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What time is shown on this clock?
8:47
11:11
2:45
A quartz clock is a clock that uses an electronic oscillator that is regulated by a quartz crystal to keep time. The crystal oscillator creates a signal with very precise frequency.
12:12
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What time is shown on this clock?
5:00
3:00
2:00
9:00
A pocket watch is a watch that is made to be carried in a pocket, as opposed to a wristwatch, which is strapped to the wrist.
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What time is shown on this clock?
3:00
There are many horology museums throughout the world. One of the most famous is the Royal Greenwich Observatory located in the United Kingdom.
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What time is shown on this clock?
9:00
6:00
There are many different types of time display. These include analog, digital, auditory, word, projection, and tactile.
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What time is shown on this clock?
3:45
1:15
12:00
Analog clocks typically use a clock face which indicates time using rotating pointers called "hands" on a fixed numbered dial or dials. The shorter hand displays the hour while the longer hand displays the minutes.
6:28
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What time is shown on this clock?
6:00
9:27
3:38
Analog clocks not only have an hour and minute hand, they frequently have a "second hand" which indicate the seconds in the current minute.
8:13
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What time is shown on this clock?
10:45
8:15
The 24-hour clock is the convention of time keeping in which the day runs from midnight to midnight and is divided into 24 hours, indicated by the hours passed since midnight, from 0 to 23. A.M and P.M. are not required.
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10:20
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What time is shown on this clock?
4:20
This system is the most commonly used time notation in the world today,[1] and is used by international standard - the International Organization of Standardization.
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9:48
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What time is shown on this clock?
12:00
1:15
2:10
The International Organization of Standardization is headquartered in Geneva, Switzerland. It formed in 1947 to promote worldwide proprietary, industrial and commercial standards across the world.
9:35
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What time is shown on this clock?
7:25
People in the practice of medicine use the 24-hour clock in documentation of care as it prevents any ambiguity as to when events occurred in a patient's medical history. the 24-hour clock is also referred to as "military time."
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What time is shown on this clock?
1:00
2:00
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7:55
A digital clock displays a numeric representation of time. Settings include a 12-hour display, which include an AM/PM indicator, and a 24-hour display.
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What time is shown on this clock?
6:25
1:10
A flip clock is an electromechanical, digital time keeping device with the time indicated by numbers that are sequentially revealed by a split-flap display. These were among the earlier versions of digital clocks.
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What time is shown on this clock?
11:10
10:45
Daylight saving time, or DST, is the practice of advancing clocks during summer months so that evening daylight lasts longer, while sacrificing normal sunrise times. It was proposed by Benjamin Franklin in 1784.
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What time is shown on this clock?
10:37
The German Empire and Austria-Hungary organized the first nationwide implementation of Daylight Saving Time, starting on April 30, 1916. Many countries have used it since then, though not all.
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What time is shown on this clock?
6:47
3:00
11:15
An auditory clock is also known as a "talking clock." It is used for various reasons, including convenience, distance, telephony or blindness.
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What time is shown on this clock?
3:30
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11:45
Historically, time standards were often based on the Earth's rotational period. In the 18th century, it was assumed that the Earth's daily rotational rate was constant, though modern research has proven otherwise.
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What time is shown on this clock?
6:25
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Sidereal time is time by the stars. A sidereal rotation is the time it takes the Earth to make one revolution with rotation to the stars, approximately 23 hours 56 minutes 4 seconds.
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What time is shown on this clock?
1:03
The principle of operation of an atomic clock is based on atomic physics. An atomic clock uses the microwave signal that electrons in atoms emit when they change energy levels.
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What time is shown on this clock?
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1:20
The idea of using atomic transitions to measure time was suggested by Lord Kelvin in 1879. Kelvin was born in 1824 in Belfast.
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What time is shown on this clock?
4:45
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4:55
The first atomic clock was an ammonia maser device built in 1949 at the U.S. National Bureau of Standards.
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What time is shown on this clock?
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6:22
Since 1967, the International System of Units has defined the second as the duration of 9192631770 cycles of radiation corresponding to the transition between two energy levels of the caesium-133 atom.
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What time is shown on this clock?
1:15
12:48
A marine chronometer is a timepiece that is precise and accurate enough to be used as a portable time standard. It is used to determine longitude by means of celestial navigation.
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What time is shown on this clock?
7:35
There are 365 days in one year. There are 43,800 minutes in one month!
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8:35
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What time is shown on this clock?
10:10
9:18
The solar eclipse of June 13, 2132 will be the longest total solar eclipse since July 11, 1991 at 6 minutes, 55 seconds. The longest duration of totality will be produced by member 39 at 7 minutes, 29 seconds on July 16, 2186.
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What time is shown on this clock?
4:00
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12:55
A smartwatch is a computerized bracelet. While early models performed basic tasks, such as calculations, translations, and game-playing, smartwatches since 2010 have been effectively wearable computers!
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What time is shown on this clock?
8:30
2:05
Apple Watch is a line of smartwatches developed, designed, and marketed by Apple Inc. It was originally released on April 24, 2015.
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What time is shown on this clock?
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7:48
Time is defined as the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future.
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What time is shown on this clock?
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9:30
Time is often referred to as a fourth dimension, along with three spatial dimensions.
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What time is shown on this clock?
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10:17
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Newtonian time is a tribute to Isaac Newton. It refers to "absolute space and time," a concept in physics and philosophy about the properties of the universe.
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What time is shown on this clock?
11:19
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10:50
Another form of timekeeping is an hourglass. The flow of sand in an hourglass can be used to measure the passage of time. It also represents the present as being between the past and the future.
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What time is shown on this clock?
4:50
Philophers Gottfried Leibniz and Immanuel Kant believed that time is neither an event nor a thing, and thus is not itself measurable nor can it be traveled.
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What time is shown on this clock?
10:56
9:45
Units of time are defined as: a second is the SI base unit; a minute is 60 seconds in length; and an hour is 60 minutes in length. A day is 24 hours or 86400 seconds in length.
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What time is shown on this clock?
7:30
Solar time is a calculation of the passage of time based on the position of the Sun in the sky. The fundamental unit of solar time is the day.
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What time is shown on this clock?
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8:30
Noon is 12 o'clock in the daytime, as opposed to midnight. The term "noon" comes from the "solar noon" when the sun transits the local celestial meridian and is the highest altitude in the sky.
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What time is shown on this clock?
9:15
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6:30
The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from the Latin, ante meridiem, meaning before midday) and p.m. (post meridiem, meaning past midday).
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What time is shown on this clock?
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10:28
The earliest form of tracking time came from water clocks from as early as the middle of the 2nd millennium BC until the early 2nd millennium.
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What time is shown on this clock?
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5:04
A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time in order to keep its time of day close to the mean solar time.
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What time is shown on this clock?
10:23
Coordinated Universal Time is abbreviated to UTC. It is the primary time standard by which the world regulates clocks and time. It is within about 1 second of mean solar time at 0° longitude. It does not observe daylight saving time.
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What time is shown on this clock?
12:07
A leap year is a calendar year containing one additional day which is added to keep the calendar year synchronized with the astronomical or seasonal year.
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What time is shown on this clock?
5:50
7:28
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3:33
The International Date Line is an imaginary line of navigation on the surface of the Earth that runs from the North Pole to the South Pole. It marks the change of one calendar day to the next and is located in the middle of the Pacific Ocean.
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