How to estimate the distance at night

Using light sources and sound sources at night can determine the distance -

1. Cigarettes and flares can be seen within 1 km;

2. Within 1.5 kilometers, you can see the light of the match and the flashlight of the flashlight;

3. The rifle fire can be seen within 2 kilometers;

4, within 0.5 km can hear people's ordinary conversation;

5. People's cries can be heard within 1.5 kilometers;

6. You can hear the car's starting sound and horseshoe sound within 1 km;

7, within 2 kilometers can hear the car horn sound;

8, gunfire can be heard within 5 kilometers.

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