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Nice discussion of astronomical timekeeping
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Nice discussion of astronomical timekeeping
On Feb 3, 8:17*pm, Dave Typinski wrote:
Enjoy: Not a single mention of how, back in the days of temperature- compensated pendulum clocks, astronomers used the transits of stars, instead of the Sun, to provide an accurate measure of time not affected by the Equation of Time since it depended on the Earth's rotation alone. Did Oriel get to him, or what? John Savard |
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Nice discussion of astronomical timekeeping
On Feb 4, 6:34*am, Quadibloc wrote:
On Feb 3, 8:17*pm, Dave Typinski wrote: Enjoy: Not a single mention of how, back in the days of temperature- compensated pendulum clocks, astronomers used the transits of stars, instead of the Sun, to provide an accurate measure of time not affected by the Equation of Time since it depended on the Earth's rotation alone. Did Oriel get to him, or what? There _is_ a discussion of sidereal time in the talk, but apparently nothing about how stellar transits were an important fundamental standard of timekeeping for many years, which I consider quite an omission. John Savard |
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Nice discussion of astronomical timekeeping
Quadibloc wrote:
On Feb 4, 6:34*am, Quadibloc wrote: On Feb 3, 8:17*pm, Dave Typinski wrote: Enjoy: Not a single mention of how, back in the days of temperature- compensated pendulum clocks, astronomers used the transits of stars, instead of the Sun, to provide an accurate measure of time not affected by the Equation of Time since it depended on the Earth's rotation alone. Did Oriel get to him, or what? There _is_ a discussion of sidereal time in the talk, but apparently nothing about how stellar transits were an important fundamental standard of timekeeping for many years, which I consider quite an omission. That's a good point, John. Mention of it would have made the lecture that much better. I thought the discussion of the SR & GR corrections in the GPS were quite good; better than I've seen elsewhere. -- Dave |
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