Answer:
3
Explanation:
The process is called triangulation and involves at least 3 stations.
The principle is that from each station, you get a distance location from that station of the event. Then from each station you make a circle with the distance measured at that station.
All three circles done form the monitoring station will meet at a point somewhere between those three stations, and you'll get your location.
That's the triangulation process. You do need 3 points for a precise reference, if you have only 2, you are usually left with 2 possibilities.
The sun rises in the west and sets in the east on these 2 planets: Venus and Uranus.
The reasons to consider San Francisco and Hong Kong as part of a same region are:
- <em>Location;</em>
Both cities are coastal cities, and they are connected with the waters of the Pacific Ocean, San Francisco directly, while Hong Kong through the waters of the South China Sea. Both of them belong to the North Pacific region.
- <em>Economy;</em>
Since they are coastal cities, and have well developed ports, big portion of the economy of the cities is reliant on the trade, and most of the trade goes through the waters of the North Pacific, both for export and import. So both of them are part of the North Pacific economic zone.