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
Convention Relating to the Distribution of Programme-Carrying Signals Transmitted by Satellite Convention Relating to the Distribution of Programme-Carrying Signals Transmitted by Satellite The Convention Relating to the Distribution of Programme-Carrying Signals Transmitted by Satellite was opened for signature on 21 May 1974 in Brussels and entered into force on 25 August 1979. It is overseen by the United Nations Committee on the Peaceful Uses of Outer Space. Convention provides for the obligation of each Contracting State to take adequate measures to prevent the unauthorized distribution on or from its territory of any programme-carrying signal transmitted by satellite. As of 2014, the convention has been ratified by 37 states; there are 10