Orientation in time. OBZhD

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BASICS OF SAFE LIFE
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Orientation in time. Basics of safe life

Fundamentals of Safe Life Activities (OBZhD)

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If the watch is lost, broken or stopped, the following methods can be used to determine the time:

1. Use of a pole that casts a shadow (Fig. 18)

time orientation

Rice. 18. Determination of time by the length of the shadow from the pole

The method is based on determining the direction to the north by the shadow of the pole.

In this case, it is necessary:

on a sunny day, stick a pole 1-1,5 m long into the ground;
determine the direction to the north by the shadow (see Fig. 12);
take the pole and place it at the intersection of the north-south and east-west lines: now the north-south line becomes the noon line, and this corresponds to 12 o'clock local time. The west direction will now correspond to 6 o'clock, and to the east - 18 o'clock.

A sundial is not a clock in the usual sense. 12 o'clock in the sundial does correspond to noon, however, the other hour hand readings, compared to normal time, are somewhat different, depending on your location and date.

Note. Instead of a pole, you can use any vertically standing object (telegraph pole, tree, rock, etc.).

2. Using the compass (Fig. 19)

time orientation

Rice. 19. Determination of time by compass

To determine the time using a compass, you need to measure the azimuth to the sun and divide its value by 15. This number corresponds to 1/24 of the circle that makes up the amount of rotation of the Earth in one hour. Add one to the resulting quotient.

The result is the local time. For example, if the azimuth to the Sun was 120°, then 120 : 15 = 8. Add one, we get 9 hours local time.

Note. Azimuth is the angle between the direction of the north and the direction of the object (in this case, the Sun).

Authors: Aizman R.I., Krivoshchekov S.G.

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