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Discussion and Debate
Discussion and Debate
Physical & Life Sciences
Non-Mainstream and Controversial Science
the myth of flat earth debunked again
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<blockquote data-quote="Hans Blaster" data-source="post: 77658296" data-attributes="member: 396028"><p>The web page shows a *model* of the flight path of Voyager it is based on all of the past observations and telemetry data.</p><p></p><p>There is no "data" on your computer. IT IS A MODEL. The forces on Voyager (mostly gravity) are well known and simple predictions of the future flight (for the next week or so) can be made based on them. Slight deviations measured by future telemetry will be used by NASA to correct the model and this is exactly how they measure the forces on V'ger.</p><p></p><p>Voyager is so far away that the delay time absolutely matters in even defining what you mean by "where is Voyager now?". Are we talking about the "now" from which the signal from the spacecraft will take 22+ hours to get here? Are we talking about the "now" of the signal that just got here and where the spacecraft was when it was emitted? I don't know what conventions NASA uses for celestial navigation, but it is not trivial. (The Earth has also moved in the 22 hours for the signal travel time.)</p><p></p><p>Mission Elapsed time is *CALCULTED* by subtracting the launch time from the current time: duration = now - launch. If you change what "now" is by resetting your clock then OF COURSE the displayed time will change. Your computer and that app have not been running continuously since the mid-70s.</p></blockquote><p></p>
[QUOTE="Hans Blaster, post: 77658296, member: 396028"] The web page shows a *model* of the flight path of Voyager it is based on all of the past observations and telemetry data. There is no "data" on your computer. IT IS A MODEL. The forces on Voyager (mostly gravity) are well known and simple predictions of the future flight (for the next week or so) can be made based on them. Slight deviations measured by future telemetry will be used by NASA to correct the model and this is exactly how they measure the forces on V'ger. Voyager is so far away that the delay time absolutely matters in even defining what you mean by "where is Voyager now?". Are we talking about the "now" from which the signal from the spacecraft will take 22+ hours to get here? Are we talking about the "now" of the signal that just got here and where the spacecraft was when it was emitted? I don't know what conventions NASA uses for celestial navigation, but it is not trivial. (The Earth has also moved in the 22 hours for the signal travel time.) Mission Elapsed time is *CALCULTED* by subtracting the launch time from the current time: duration = now - launch. If you change what "now" is by resetting your clock then OF COURSE the displayed time will change. Your computer and that app have not been running continuously since the mid-70s. [/QUOTE]
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the myth of flat earth debunked again
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