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SEE ALL Consumer Reports product reviews. ... The Sennheiser PXC 550-II is one of the highest-scoring headphones in our ratings, with superb sound quality and noise canceling. The PXC 550-II is as ...
Consumer Reports is a United States-based non-profit organization which conducts product testing and product research to collect information to share with consumers so that they can make more informed purchase decisions in any marketplace.
NASA maintains civilian databases of GP orbital elements, also known as NASA or NORAD two-line elements. The GP element sets are "mean" element sets that have specific periodic features removed to enhance long-term prediction performance, and require special software to reconstruct the compressed trajectory .
The ratings are based on items including surveys of consumers, reports from undercover shoppers, expert surveys, the number of consumer agency complaints against a company or service provider, and an analysis of publicly available databases. The first publication only covered the Washington DC area.
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Consumer Reports (CR), formerly Consumers Union (CU), is an American nonprofit consumer organization dedicated to independent product testing, investigative journalism, consumer-oriented research, public education, and consumer advocacy.
This set of models is often referred to collectively as SGP4 due to the frequency of use of that model particularly with two-line element sets produced by NORAD and NASA. These models predict the effect of perturbations caused by the Earth’s shape, drag, radiation, and gravitation effects from other bodies such as the sun and moon.
A customer review is an evaluation of a product or service made by someone who has purchased and used, or had experience with, a product or service. Customer reviews are a form of customer feedback on electronic commerce and online shopping sites.