See the invisible
Albert Einstein’s 1905 paper “On the Electrodynamics of Moving Bodies” introduced — — “Time cannot be absolutely defined and there is an inseparable relation between time and signal velocity”.Under this new theory, the only means to define time is in reference to a definite system of linked, coordinated, and synchronized clocks.
”Time can not be absolutely defined and there is an inseparable relation between time and signal velocity”
A clock signifies occupations and undertakings, movements and the start of transactions.
We need to synchronize our commitments and activities with measures both reliable from error and secure from strategic tampering — — with the spread of technologies to both independently measure the time and to broadcast a standard version of the time. These technologies revolutionized human relationships.
“My belly was my sundial — only surer,
Truer, and more exact than any of them.
This dial told me when ‘the proper time
To go to dinner, when I ought to eat;
But nowadays, why even when I have,
I can’t fall to unless the sun gives leave.”
The town’s so full of these confounded(confused) dials!”Time synchronizing also let the idler’s peers know just how much of their day they sacrificed while he naped. Cosmic events have a crucial integrity property — they occur independently of the manipulation of humans. The movements of sun, moon, and stars are also reliable. They thus served as a fair standard of time.
Church Bell
Origin from -call people to worship. was adopted at around 550 in France then spread into Great Britain. It wasn’t until about 750 that bells were rung at specific times of the day. This form of public time broadcast affected the architecture and design of cities, for fair markets and dispute resolution.
What — Tower Bell ringing is a team activity that is based on a mathematical array of numbers. It stimulates the brain. (Raising your arms above your head for as long as 1hour provides good upper body exercises)
Who — The team refer to themselves as bell ringers. They come from all walks of life, young and old and different backgrounds. Bell ringing is the activity of ringing the bells.
Method — — These methods are memorised by the bell ringers. There is fairly simple method e.g. Bobs. As the tune gets more sophisticated then the method becomes more complex. All rely on the skill of the bell ringers ability to vary their own bell speed at the same time recognising the position of all the bells around them and recalling from memory a pattern of bells. Campanology refers to the technology of bells, how they are cast, tuned and sounded.
GPS and Time:
Global Positioning System(GPS) consists of 24 satellites and a ground station. Each satellite rotates around the specific orbit. They are located about 12,000 miles above Earth and travel at the speed of 7,000 miles per hour (National Geographic,2013, page1). It is known that the GPS system can calculate the precise position on the earth surface and it is finding ways into any industries to everyone. Most people feel the passage of time through sun rising and set every day in life. It seems earth and solar ‘s rotation regulates our life under the black cover. If GPS system were an advanced telescope the US military sent into outer space, the ‘atomic clock’ equipped on each satellite would be a powerful mechanism that enables people to acquire the accurate oscillation frequency of earth’s rotation period. Thus, GPS receiver can analyze very precious time data from GPS signals and these time data now has been distributed into various areas in the world.
Synchronizing time through GPS system is difficult to understand as it involves in mathematics, physics and astronomy. It has built a shortcut to connect the earth surface with the universe. In this system, only after obtaining precise time, people could measure the valid distant from a satellite. Thus, time became a quite elementary measurement, controlling works happen. It is showed below (Bajaj, 2002, page92–94):
(1) “triangulating” position from satellite: GPS system can track user’s present position by calculating distant from 3 satellites.
(2) to finish step (1), GPS needs to measures radius(distance) using travel time of signals data. (3) to finish step (2), GPS needs to acquire precise time which sometimes are tiny numbers.(4) every GPS receiver needs to make correlation because any signals will delay during travelling through the atmosphere, such as “Error Modeling” offset correlation.
After time recognized by a master clock or GPS module, it will be transmitted into time server and synchronized by any necessary fields in daily life.
satellite signals:
GPS system actually sends a sequence of data to thousands of receivers on earth through radio signals. According to Mauro proved that the most fundamental part of GPS radio signals is the ‘Pseudo Random Code’, which is composed of a sequence of code “0” and “1”.When I learned about this form of signals, it reminded me of historical “radiotelegraph secret”, which was packaged in the same method. When information became not visible to all public, they are sent into a specific person or company under protective cover. There must be an efficient way to unzipped this “covered clothes” because some inherent regular. For example, although each satellite has ubiquitous Pseudo-Random Code, which complexity guarantees GPS receiver cannot accidentally absorb in another GPS signals, all the satellites still use same frequency regular frequency without interfering with each other.
