A while ago, there were three types of sirens “Zommara" in the city Kairouan:

The first served to alert the populations during the bombardments of the Second World War (1939-45).

The second installed with “dar el mouirakeb” (local regent) closed to the Splendid Hotel was used only once a day to indicate the time to people at midday “Laouel” from where the expression towards the blow of midday one will be seen after “laouel”.

Thus, the autochtones which did not have watches and which were accustomed since long time to rise early and to lie down at the same time as the sun had to yield with the straightness of the zommara.

Some rare people are privileged from it to regulate their watches.

The day is divided into two parts before and after midday “kbal and “bâad laouel”. There were only two quite distinctive repairs.

Even currently, to fix an appointment, one refers to the hours of prayer, usually will say “ baâd Al asr” after the prayer of el asr etc ... Ahmed Ibn Ibrahim ESSOUSSI invented a sun dial which will fix with precision the hours of prayer (1258 H) which is installed with the patio of the large mosque.

In addition to the newspapers, radio and TV, one currently there are a number of watches in the market and portables gadgets which tell the hours of prayer if you are far away from a mosque, otherwise, it is act of the “muezzin” who calls the faithful from the top of the minaret.

The third type, is the one with less noise, used to make sounds in local streets for the people who sells ice cream 'Jilat ".

In Kairouan, do not get dominated by your watch since the time is precious. If not you will be very unhappy. Because time here is often the time of waiting. Everyone is waiting for something, this person is waiting for the bus, this one is waiting for a taxi, the other is waiting to harvest ….

Let us see where and why we are searching for time.
After the precursors Isaac Newton and Albert Einstein, currently there are many scientists working on the same subject and showed that it is possible to travel towards the future, the past and to return to the present:

To travel towards the future :
It is certainty today: it is possible to travel towards the future. Let us use the dilation of time to travel in the future.

The principle is simple. It is enough to move at high speed compared to the Earth then to return. But to reach a high speed, it is initially necessary to accelerate.

The human being cannot feel the speed, feels only the acceleration. Otherwise, the one can travel as quickly as he wants, but the organism will not support a too strong acceleration for a long time.

On Earth, we are permanently submitted to gravity, which is an acceleration of 9.81 m/s2. If a vehicle moves in space at this speed, the human inside will undergo gravity equal to that undergoes on Earth.

To travel towards the future, it is thus enough to travel in space with an acceleration of 9.81 m/s2. Arrived at mid- course, one turns over the rocket in order to slow down until the objective. Then, it is enough to return by the same method. The formula which makes it possible to calculate the dilation of time is not also any that simple, because speed is not constant any more.

It is thus possible to go on a journey 60.000 years in the future, the time of a human life. But this method does not allow any return. The traveller will be able to never return at his time. It still remains to find a vehicle who could carry out this exploit.

Unfortunately, this vehicle will have to consume in one year more than the energy currently produced on Earth for this period. It is thus necessary to imagine new sources of energy.

This vessel could not embark of fuel but collect the protons which circulate freely in the intersidereal vacuum. It is necessary to find a means to easily collect them and transform them into energy.
The voyages of the future are announced enthralling.

To travel towards the past :
The equations of Einstein make it possible to discover very odd physical structures. In addition to the black holes, there are perhaps Holes of worms.

Concretely, a hole of worm consists of 2 mouths and a throat. It is possible to pass from a mouth to the other while passing by the throat. It is also possible to move each mouth individually.

The interest is that the throat keeps the same size. Therefore, if one moves the 2 mouths very far, it is possible to pass from a point of the Universe to another in very little time.

The hole of worm above makes it possible to travel in space, but not in time.

Let us move one of the mouths at high speed compared to the other. While the 2 mouths move away, it undergo a difference in flow of time.

Let us suppose that mouth A remains on Earth. The mouth B travels until the center of the galaxy then returns, with an acceleration of 9.81 m/s2, as indicated above.

On its return, 60.000 years will have been passed on Earth, but the mouth B lived only 40 years. Therefore, if a human being travelling beside the hole of worm, it can visit the world such as it will be in 60.000 years.

After this voyage, free to borrow the hole of worm, to arise by mouth A. As the two mouths remain connected through space and time, the traveller will arise 60.000 years earlier. Free to tell what he saw.

Let us notice that as soon as the hole of worm became a temporal machine, the men remained on Earth, can also use throats to explore the future, and then to return in the present.

This method thus makes it possible to travel towards the past. But there is a strong constraint. One cannot go up before the creation of the hole of worm.

If no hole of worm currently exists, no traveller of the future can arrive to us.

The past is definitively lost. But a hole of temporal worm exists perhaps, that is in a natural way in the Universe, or created by an intelligent extraterrestrial civilization (if there is).

Mohamed Rebai
info@kairouan.org