The answer is when the sun and the moon are at the right angles to the earth
Which make the sun, the earth and the moon formed a 90 degree angle.
during neap tides, the gravitational forces between the 3 counteract one another, creating a weaker tidal forces
Shinzo Abe: Japan
Chiang Kai-shek: China
Kim Jong Un: North Korea
Park Geun-hye: South Korea
Mao Zedong: Taiwan
You see how much the scale is, let's say that it is 150 mm=300 miles. If it goes over, you can measure it with a ruler, or move with your hands, measuring it as well as possible and estimating. Hope this helps! :)