Precise Point Positioning (PPP) is widely used for high-accuracy navigation, but broadcast ephemeris from the BDS-3 system still suffers from hourly ...
The arrival of a new type of timekeeper heralds the end of the second as we know it, as Helen Margolis explains. Fifty years ago, the General Conference on Weights and Measures decided that the time ...
Many years ago, on a trip to Mumbai to meet my father, we were talking about a forthcoming solar eclipse and whether I would be able to view it in Delhi. He immediately took out a little book, looked ...
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