The late Olmec people of south-central Mexico began to use a true zero ( a shell glyph ) in the New World possibly by the but certainly by 40 BC, which became an integral part of Maya numerals and the Maya calendar.
22.
Even though the Insight became the first product ever honored by the Sierra Club for " excellence in environmental engineering, " environmentalists worry that the auto industry will try to argue that hybrids, which still emit low levels of pollutants, should be allowed to substitute for true zero-emission vehicles, weakening air-quality goals.
23.
Some of Ptolemy's true zeros appeared in the first line of each of his eclipse tables, where they were a measure of the angular separation between the center of the Moon and either the center of the Sun ( for solar eclipses ) or the center of Earth's shadow ( for lunar eclipses ).
24.
It is chiefly noted for the fact that it lies directly on the Greenwich meridian and, being the highest point on that bearing directly visible from Greenwich, was at one time used as a marker by geographers at the observatory there to set their telescopes and observation equipment to a true zero degree bearing.
