Sundial,sand clock and 1.calculating the one sun rise to the next sun rise is called the a day or a solar day.2.from one new moon day to the next new moon day is called a month.3.the time taken by the earth to complete one revelution is called a year

Types of Clocks Used by Early Man

Early man had a deep fascination with measuring time and tracking its passage. While they did not have the advanced technology we possess today, they developed various types of clocks to mark the passage of time. These clocks were simple yet effective tools that helped them track seasons, coordinate activities, and navigate their surroundings. Let us explore some of the different types of clocks used by early man and their significance.

Sundial
- The sundial is one of the earliest known types of clocks used by early man.
- It utilizes the position of the sun to indicate the time.
- A flat plate or surface with a raised pointer (gnomon) casts a shadow onto hour lines or numbers.
- As the sun moves across the sky, the shadow changes position, allowing people to determine the time of day.
- Sundials were widely used in ancient civilizations such as Egypt, Greece, and Rome.
- They were relatively accurate during sunny days, but their effectiveness was limited during cloudy or nighttime conditions.

Water Clock
- Water clocks, also known as clepsydra, were among the first mechanical clocks used by early man.
- They measured time by the regulated flow of water from one container to another.
- A container with a small hole at the bottom allowed water to drip into another container.
- The rate of flow was carefully calibrated, with markings on the second container indicating the passage of time.
- Water clocks were used in various ancient civilizations, including Mesopotamia, Egypt, and China.
- They were particularly useful during the night when sundials were ineffective.
- However, variations in water temperature and pressure could affect their accuracy.

Obelisk Shadow Clock
- The obelisk shadow clock was a unique type of clock used by ancient Egyptians.
- It consisted of an obelisk, a tall, four-sided monument with a pointed top.
- The obelisk would cast a shadow on the ground, and markers on the ground tracked the shadow's movement throughout the day.
- The length and position of the shadow allowed people to estimate the time.
- This type of clock was primarily used in temples and other significant structures.
- It was accurate during sunny days but lacked precision during cloudy or rainy weather.

Moon Dial
- The moon dial was a specialized clock used to track the position of the moon.
- It consisted of a flat plate with markings representing the lunar phases.
- The position of the moon's shadow on the dial indicated the current phase of the moon.
- Early man used moon dials to determine the lunar month and plan activities accordingly.
- Moon dials were commonly found in ancient civilizations, including Babylon, China, and Greece.
- However, they were restricted to nighttime use and required clear visibility of the moon.

Conclusion
Early man's ingenuity and curiosity led to the development of various clocks to measure time. The sundial, water clock, obelisk shadow clock, and moon dial were among the notable types of clocks used by early man. While these clocks may seem rudimentary by today's standards, they played a crucial role in early civilizations, enabling them to track time, organize their lives, and understand the celestial movements. These clocks laid the foundation for the development of more sophisticated timekeeping devices that we use today.