September 2015

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The Global Positioning System (GPS) is a constellation of twenty-one primary satellites, and three spares, in near-circular orbits 11,000 miles above the earth at an inclination of 55 degrees to its equator. While the satellites are best known for their role in allowing the precise location of individuals and objects, by 1995 they had been […]

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Alexa

2015-09-29

in Photo of the day

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During the readout of Vela 6911, AFTEC personnel watched as a stylus drew a figure representing the variations in light intensity, as monitored by the two satellite bhangmeters. There was no data from a third optical sensor, whose mission was to provide the geographic origin of any noticeable flash of light, because it was out […]

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Wolves

2015-09-28

in Photo of the day

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Justin Trudeau apparently dislikes being reminded about the science of climate change and the implications for Canada’s bitumen sands: The environmentalist advised Trudeau about accepting the internationally agreed target for a two-degree rise in global temperature means that 80 per cent of the oil sands would have to stay in the ground. Suzuki said Trudeau […]

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New dietary guidance from the Heart and Stroke Foundation warns against “ultra-processed foods”, those that are “nutritionally unbalanced foods high in sugar, fat and salt manufactured in a way to promote over-consumption and are associated with weight gain and high blood pressure”. They include “soft drinks, packaged fruit juices, cookies, ice cream, salty snacks, ready […]

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