Determining the coordinates with the help of technological means such as satellites, or with the help of printed atlases. How Are The Times Calculated? 1 2 Determining the time zone 3 Determining climatic and geological factors such as heat, humidity and air pressure. 4 Determining whether summer/winter times are used. 5 The altitude of the city calculated and the height of tallest building people live in is determined and added to the calculation. 6 Determining the north-east-south-west points of the city and using fixed Tamkin (caution) to cover the land dispersion.