Timeline for Leading-order cause of diurnal (not semidiurnal) variations in $g$?
Current License: CC BY-SA 4.0
11 events
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| Sep 24, 2020 at 19:40 | history | edited | Mike | CC BY-SA 4.0 |
Replace dead link with link to web archive version
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| Aug 1, 2014 at 17:19 | vote | accept | CommunityBot | moved from User.Id=4552 by developer User.Id=76591 | |
| Aug 1, 2014 at 16:26 | comment | added | rob♦ | A hearty +1 for reproducing the plot in question! | |
| Aug 1, 2014 at 12:15 | history | edited | Floris | CC BY-SA 3.0 |
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| Jul 31, 2014 at 20:11 | comment | added | Floris | Of course what I just said applies to the tides due to the sun (the weaker ones). Because the moon's orbit is not coplanar with the earth's around the sun, things are a bit more complicated still. But I do believe that positions closer to the equator should have less of a 24 hour component in their gravitational variation. | |
| Jul 31, 2014 at 19:47 | comment | added | Floris | @DavidHammen - it depends on the time of the year and the relative phases of the sun and moon. Around the equinox the equator should give something close to a sinusoid. My initial plots were for a different date than the final one... I had some trouble interpreting the BASIC code so my date was off for the first three plots (but not the last one). | |
| Jul 31, 2014 at 19:40 | comment | added | David Hammen | There's something wrong with that program. I just modified a detailed spacecraft launch simulation to compute the tidal gravitational acceleration. Then I never launched the vehicle. I just let it sit on the pad for four days, starting from 06:00Z May 1, 1981. Then I ran the sim a few times, moving the launchpad around the globe. I didn't see a nice sinusoid. I always saw a sum of multiple sinusoids, with ~half day and ~full day components. That makes sense. The Earth's rotation axis is tilted by about 23 degrees the Earth's orbit about the Sun. You should never see a pure sinusoid. | |
| Jul 31, 2014 at 16:28 | history | edited | Floris | CC BY-SA 3.0 |
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| Jul 30, 2014 at 22:03 | history | edited | Floris | CC BY-SA 3.0 |
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| Jul 30, 2014 at 18:36 | history | edited | Floris | CC BY-SA 3.0 |
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| Jul 30, 2014 at 18:16 | history | answered | Floris | CC BY-SA 3.0 |