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# 2.5 Times and places

Frank L. Preuss

Times and places are listed here, which allow a comparison. When it is for example midnight in Fiji, islands in the Pacific Ocean, then it is midday in London, in England, and also in Accra, in Ghana. And it is then 1 p.m. in Görlitz, in Germany, and 5 a.m. in Denver, USA.

The difference between London and Görlitz is 15o or 1 hour. The difference between London and Denver is 105o or 7 hours.

An aeroplane flying around the earth above the equator with the same speed as the sun goes round earth, would need 24 hours for the 40 000 km and that would be 1667 km/h and that would be faster than sound travels, 1229 km/h.

If a man wants to fly slower and not such a big distance, then he can fly above the Arctic Circle. He could start and end his trip in Rovaniemi, in Finland, 26o East, 26 degrees of longitude, and 66o 30' North, 66.5 degrees of latitude. That are 23,5o from the North Pole and that is the same distance of the two tropics from the equator. The Arctic Circle is 17 415 km long and the man's speed would then be 726 km/h.

A meridian is that great circle passing through the poles of the celestial sphere which cuts the observer's horizon in the north and south points, and also passes through the zenith. Also meridian of longitude.

A meridian is the circle of constant longitude, passing through given place and terrestrial poles; corresponding line on map or sky.

This is the end of "2.5 Times and places"
To the German version of this chapter: 2.5 Zeiten und Orte.

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