Tidal range Tidal range Tidal range is the height difference between high tide and low tide. Tides are the rise and fall of sea levels caused by gravitational forces exerted by the Moon and Sun and the rotation of Earth. Tidal range is not constant but changes depending on the locations of the Moon and Sun. The most extreme tidal range occurs during spring tides, when the gravitational forces of both the Moon and Sun are aligned (syzygy), reinforcing each other in the same direction (new moon) or in opposite directions (full moon). During neap tides, when the Moon and Sun's gravitational
Agreement between Great Britain and Portugal Relating to the Suppression of the Capitulations in Egypt Agreement between Great Britain and Portugal Relating to the Suppression of the Capitulations in Egypt The Agreement between Great Britain and Portugal Relating to the Suppression of the Capitulations in Egypt (1920) was an agreement concluded between the British and Portuguese governments in Lisbon on 9 December 1920, in order to regulate legal relations between Portuguese citizens and the court system in Egypt. Ratifications were exchanged in Lisbon on 29 September 1921 and the agreement went into effect. It was registered in the "League of Nations Treaty Series" on 12 December 1921. The capitulations system had been introduced into the