Today, checking the time is effortless. A quick glance at a wristwatch, a wall clock, or even a mobile phone instantly tells us whether we are late for class, early for an appointment or right on time. Time controls almost every part of our daily lives. From school schedules and office hours to train timings and exam routines, we are dependent on the twelve-numbered dial. But this convenience raises an important question: what about the people who lived long before clocks and watches existed? Did they not need to know the time?
The answer is that they did. Ancient humans also needed to organise their day, decide when to work or rest, perform rituals and grow crops. They used different methods which were not random guesses, but systems that helped societies function smoothly for centuries. Today, we will explore the different types of timekeeping methods used before clocks and discover how people understood and measured time without machines.
Sun-based timekeeping:
The earliest way humans measured time was by observing the Sun. As the Sun rises, moves across the sky and sets, its position creates changing shadows. Ancient people learned to read these shadows like a natural clock. One of the most important sun-based devices was the sundial. It consisted of a stick or pillar, called a gnomon. It was placed upright on a flat surface. As the sun moved, the shadow of the gnomon shifted across marked sections, indicating different times of the day. Sundials were widely used in Egypt, Greece, Rome, India and China. However, they worked only during sunlight, and their accuracy changed with seasons and geographical location.
Another early invention was the shadow clock or the portable sundial. These were portable instruments that measured time by the length of shadows, making them useful for travellers.
Water-based timekeeping:
Sundials are dependent on the Sun, but what happens at night or on cloudy days? Ancient civilisation relied on an innovative water-based timekeeping method. Known as a clepsydra or water clock, this timepiece was especially helpful on cloudy days or at night. It is one of the oldest time-measuring instruments. The word clepsydra comes from Greek and means ‘water thief.’ It refers to the slow and steady movement of water used to measure time. A water clock worked by allowing water to either flow into a container or drain out of it through a small, carefully controlled hole. Markings inside the vessel showed the passing of hours as the water level rose or fell. Some advanced versions used floats and simple mechanical parts to improve accuracy. The earliest water clocks were used in ancient Egypt. They also existed in Babylon and Persia around the 16th century BC. Other regions of the world, including India and China, also provide early evidence of water clocks. Beyond daily timekeeping, water clocks were used in courtrooms to limit speeches and during public debates.
Sand clock method:
Another important method of measuring time before clocks was the sand clock, commonly known as the hourglass. This device used sand flowing at a steady rate from an upper glass bulb to a lower one through a narrow opening. The time taken for all the sand to pass through measured a fixed interval. Sand clocks became popular during the medieval period, especially in Europe. It was widely used on ships as well. Sailors relied on them to track duty shifts, navigation schedules and meal times.
However, sand clocks could only measure short, fixed periods and had to be turned over repeatedly. Despite the limitation, their simplicity and reliability made them an essential timekeeping tool.
Candle clocks:
Another clever way of measuring time was with candle clocks. It used the steady burning of wax to mark the passing hours. A candle clock was simply a candle that had evenly spaced markings along its length. As the candle burned down, it melted the wax little by little. When the flame reached each mark, it showed how much time had passed since the candle was lit. The earliest written reference to candle clocks is from a Chinese poem at AD 520. Similar candles were later used in Japan, and in the medieval period Europe, King Alfred the Great was said to have used candle clocks that burned one after one for an entire day.
Incense clocks:
This method is the burning of incense to mark the passage of time. The burning of incense was already valued in many cultures for religious purposes and daily use. Incense clocks originated in China and spread to neighbouring countries such as Japan and Korea. Incense clocks were essentially special burners filled with calibrated incense sticks or powdered incense that burned at a steady rate. As the incense burned, the length or pattern that remained showed how much time had passed. Some incense clocks were simple sticks marked at intervals, while others were elaborate patterns or spirals that could burn for hours or even longer. In some versions, small weights hung along the incense thread would drop and make a sound when a certain amount of incense had burned. This acted like an alarm. Different scents at different stages could even help tell time by smell alone. These clocks were useful in homes, temples, and night watches.
Today, time is measured with the tap of a screen or the glance of a watch. However, these ancient methods remind us that long before modern technologies, humans relied on observation, creativity and intelligence. By reading the sky, water, and fragrance, early civilisation learned to understand time itself. These inventions reflect how human curiosity and innovation laid the foundation of the world we live in today.